Trapping checkbox = true in a datagrid ? 
Author Message
 Trapping checkbox = true in a datagrid ?

How/Where do I determine if a checkbox column in a winforms datagrid edit
has been changed to true and run some code if it has?

Colin



Mon, 31 Jan 2005 20:25:13 GMT  
 Trapping checkbox = true in a datagrid ?
Hi Colin,
Have you tried handling the ColumnChanging event of the table the grid is
bound to? This will let you know when the value changes but only after you
move off the cell with the checkbox. (you might also want to handle
RowChanging as well).
If you want to find out that the checkbox has changed, but the change hasn't
been committed to the table yet then you need to do a little more work.
There is an example of this at
http://www.syncfusion.com/FAQ/WinForms/FAQ_c44c.asp#q874q

Our BooleanColumn provides an event when the value is changed and is also
considerably more flexible than the standard DataGridBoolColumn, you can
check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

I hope some of this helps you
J.

Jasmine
www.datagridcolumnstyles.net
Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid

Quote:

> How/Where do I determine if a checkbox column in a winforms datagrid edit
> has been changed to true and run some code if it has?

> Colin



Mon, 31 Jan 2005 20:45:00 GMT  
 Trapping checkbox = true in a datagrid ?
the rowchanging event will work fine in this app but I can see the need to
purchase some decent controls growing  the more i get into this project. it
seems MS Neglected winforms controls in a rush to get the product out, they
are lacking so many requirements !

How do i write the handler for it, I have tried the following but it does
not work:

Private Sub orderRowChanging(ByVal sender As System.Object, ByVal e As
DsOrders.tblOrdersRowChangeEvent) Handles DataGrid1.CurrentCellChanged

It says the signature doesnt match for either the cellchanged or the
navigate event

Colin



Quote:
> Hi Colin,
> Have you tried handling the ColumnChanging event of the table the grid is
> bound to? This will let you know when the value changes but only after you
> move off the cell with the checkbox. (you might also want to handle
> RowChanging as well).
> If you want to find out that the checkbox has changed, but the change
hasn't
> been committed to the table yet then you need to do a little more work.
> There is an example of this at
> http://www.syncfusion.com/FAQ/WinForms/FAQ_c44c.asp#q874q

> Our BooleanColumn provides an event when the value is changed and is also
> considerably more flexible than the standard DataGridBoolColumn, you can
> check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

> I hope some of this helps you
> J.

> Jasmine
> www.datagridcolumnstyles.net
> Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid


> > How/Where do I determine if a checkbox column in a winforms datagrid
edit
> > has been changed to true and run some code if it has?

> > Colin



Mon, 31 Jan 2005 21:21:49 GMT  
 Trapping checkbox = true in a datagrid ?
The way I'd do it is load the initial value into a separate, hidden
column...compare the two whenever you want and if they're not the same, then
obviously it's changed.

Jim

Quote:

> How/Where do I determine if a checkbox column in a winforms datagrid edit
> has been changed to true and run some code if it has?

> Colin



Mon, 31 Jan 2005 21:19:15 GMT  
 Trapping checkbox = true in a datagrid ?
Colin
You are mixing up the RowChanging handler and the CurrentCellChanged
handler.
The RowChanging and ColumnChanging events are raised by the DataTable that
contains the data showing in the grid. Remember these events only fire as
the change is being committed to the table, not everytime it changes in the
cell.

The handlers should be defined like this, bearing in mind that they are
handling events from a DataTable.

Private Sub myRowChanging( sender as Object,  e as DataRowChangeEventArgs)
Handles myTable.RowChanging

End Sub

Private Sub myColumnChanging(sender as Object, e as
DataColumnChangeEventArgs) Handles myTable.ColumnChanging

End Sub

then inside the handlers you can get access to the current row through the
e.Row property.

I apologize if these handlers aren't quite correct, I'm a C# developer
really and I'm just writing these off the top of my head so my syntax might
be slightly off, I'm not sure if you need the ByVal keyword before the
parameters. If they don't work, post back and I'll do them in code and get
them right !!

J.

Jasmine
www.datagridcolumnstyles.net
Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid

Quote:

> the rowchanging event will work fine in this app but I can see the need to
> purchase some decent controls growing  the more i get into this project.
it
> seems MS Neglected winforms controls in a rush to get the product out,
they
> are lacking so many requirements !

> How do i write the handler for it, I have tried the following but it does
> not work:

> Private Sub orderRowChanging(ByVal sender As System.Object, ByVal e As
> DsOrders.tblOrdersRowChangeEvent) Handles DataGrid1.CurrentCellChanged

> It says the signature doesnt match for either the cellchanged or the
> navigate event

> Colin



> > Hi Colin,
> > Have you tried handling the ColumnChanging event of the table the grid
is
> > bound to? This will let you know when the value changes but only after
you
> > move off the cell with the checkbox. (you might also want to handle
> > RowChanging as well).
> > If you want to find out that the checkbox has changed, but the change
> hasn't
> > been committed to the table yet then you need to do a little more work.
> > There is an example of this at
> > http://www.syncfusion.com/FAQ/WinForms/FAQ_c44c.asp#q874q

> > Our BooleanColumn provides an event when the value is changed and is
also
> > considerably more flexible than the standard DataGridBoolColumn, you can
> > check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

> > I hope some of this helps you
> > J.

> > Jasmine
> > www.datagridcolumnstyles.net
> > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
DataGrid


> > > How/Where do I determine if a checkbox column in a winforms datagrid
> edit
> > > has been changed to true and run some code if it has?

> > > Colin



Mon, 31 Jan 2005 21:38:57 GMT  
 Trapping checkbox = true in a datagrid ?
I can compile ok but the de{*filter*} never gets to the event after I edit
datagrid and move to a new row , or even if I save changes back to database
any ideas ?

I have in my declarations section:
Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

then a sub declared as below , my Datagrid is bound to the table
dsOrders.tblOrders

Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As Object,
ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
event_tblorders.tblOrdersRowChanging

'detects changes to planned checkbox when record is moved

MsgBox(e.Row.Item("planned"))

End Sub

I got the ide to create the handler after creating the event in the
declarations section so I am sure it is correct syntax, Datagrid1 is bound
to dsOrders.tblOrders am I missing something Here

Colin



Quote:
> Colin
> You are mixing up the RowChanging handler and the CurrentCellChanged
> handler.
> The RowChanging and ColumnChanging events are raised by the DataTable that
> contains the data showing in the grid. Remember these events only fire as
> the change is being committed to the table, not everytime it changes in
the
> cell.

> The handlers should be defined like this, bearing in mind that they are
> handling events from a DataTable.

> Private Sub myRowChanging( sender as Object,  e as DataRowChangeEventArgs)
> Handles myTable.RowChanging

> End Sub

> Private Sub myColumnChanging(sender as Object, e as
> DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> End Sub

> then inside the handlers you can get access to the current row through the
> e.Row property.

> I apologize if these handlers aren't quite correct, I'm a C# developer
> really and I'm just writing these off the top of my head so my syntax
might
> be slightly off, I'm not sure if you need the ByVal keyword before the
> parameters. If they don't work, post back and I'll do them in code and get
> them right !!

> J.

> Jasmine
> www.datagridcolumnstyles.net
> Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid


> > the rowchanging event will work fine in this app but I can see the need
to
> > purchase some decent controls growing  the more i get into this project.
> it
> > seems MS Neglected winforms controls in a rush to get the product out,
> they
> > are lacking so many requirements !

> > How do i write the handler for it, I have tried the following but it
does
> > not work:

> > Private Sub orderRowChanging(ByVal sender As System.Object, ByVal e As
> > DsOrders.tblOrdersRowChangeEvent) Handles DataGrid1.CurrentCellChanged

> > It says the signature doesnt match for either the cellchanged or the
> > navigate event

> > Colin



> > > Hi Colin,
> > > Have you tried handling the ColumnChanging event of the table the grid
> is
> > > bound to? This will let you know when the value changes but only after
> you
> > > move off the cell with the checkbox. (you might also want to handle
> > > RowChanging as well).
> > > If you want to find out that the checkbox has changed, but the change
> > hasn't
> > > been committed to the table yet then you need to do a little more
work.
> > > There is an example of this at
> > > http://www.*-*-*.com/ #q874q

> > > Our BooleanColumn provides an event when the value is changed and is
> also
> > > considerably more flexible than the standard DataGridBoolColumn, you
can
> > > check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

> > > I hope some of this helps you
> > > J.

> > > Jasmine
> > > www.datagridcolumnstyles.net
> > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> DataGrid


> > > > How/Where do I determine if a checkbox column in a winforms datagrid
> > edit
> > > > has been changed to true and run some code if it has?

> > > > Colin



Mon, 31 Jan 2005 22:54:56 GMT  
 Trapping checkbox = true in a datagrid ?
I prever jasmines approach if I can get it to work!

I could then use one handler to check for several scenarios and do some data
validation

Colin


Quote:
> The way I'd do it is load the initial value into a separate, hidden
> column...compare the two whenever you want and if they're not the same,
then
> obviously it's changed.

> Jim


> > How/Where do I determine if a checkbox column in a winforms datagrid
edit
> > has been changed to true and run some code if it has?

> > Colin



Mon, 31 Jan 2005 22:58:00 GMT  
 Trapping checkbox = true in a datagrid ?
Colin,
I'm not sure why your code isn't working, it looks as if it should.
I've done a quick test just using a DataTable built in the form.
If you'd like to try this just create a new form and add a datagrid and a
button then paste this code just after the Designer Generated code region.
Press the Button to load the grid with the data and the output window should
fill up with the events as you change values in the grid.
I've noticed that the datagridboolcolumn fires columnchanging events even
when the column hasn't actually changed, particularly when you highlight a
checkbox and the use the scrollbar.
I'll look into that further.

here's the code
Private WithEvents myDataTable As New DataTable("Test")
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
DataGrid1.DataSource = myDataTable
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
myDataTable.Columns.Add("Forename", System.Type.GetType("System.String"))
myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))
myDataTable.Columns.Add("Lastname", System.Type.GetType("System.String"))
myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
myDataTable.AcceptChanges()
End Sub
Private Sub myRowChanging(ByVal sender As Object, ByVal e As
DataRowChangeEventArgs) Handles myDataTable.RowChanging
Console.WriteLine("RowChanging")
End Sub
Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
Console.WriteLine("ColumnChanging")
End Sub

J.

Jasmine
www.datagridcolumnstyles.net
Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid

Quote:

> I can compile ok but the de{*filter*} never gets to the event after I edit
> datagrid and move to a new row , or even if I save changes back to
database
> any ideas ?

> I have in my declarations section:
> Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> then a sub declared as below , my Datagrid is bound to the table
> dsOrders.tblOrders

> Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As Object,
> ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> event_tblorders.tblOrdersRowChanging

> 'detects changes to planned checkbox when record is moved

> MsgBox(e.Row.Item("planned"))

> End Sub

> I got the ide to create the handler after creating the event in the
> declarations section so I am sure it is correct syntax, Datagrid1 is bound
> to dsOrders.tblOrders am I missing something Here

> Colin



> > Colin
> > You are mixing up the RowChanging handler and the CurrentCellChanged
> > handler.
> > The RowChanging and ColumnChanging events are raised by the DataTable
that
> > contains the data showing in the grid. Remember these events only fire
as
> > the change is being committed to the table, not everytime it changes in
> the
> > cell.

> > The handlers should be defined like this, bearing in mind that they are
> > handling events from a DataTable.

> > Private Sub myRowChanging( sender as Object,  e as

DataRowChangeEventArgs)

- Show quoted text -

Quote:
> > Handles myTable.RowChanging

> > End Sub

> > Private Sub myColumnChanging(sender as Object, e as
> > DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> > End Sub

> > then inside the handlers you can get access to the current row through
the
> > e.Row property.

> > I apologize if these handlers aren't quite correct, I'm a C# developer
> > really and I'm just writing these off the top of my head so my syntax
> might
> > be slightly off, I'm not sure if you need the ByVal keyword before the
> > parameters. If they don't work, post back and I'll do them in code and
get
> > them right !!

> > J.

> > Jasmine
> > www.datagridcolumnstyles.net
> > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
DataGrid


> > > the rowchanging event will work fine in this app but I can see the
need
> to
> > > purchase some decent controls growing  the more i get into this
project.
> > it
> > > seems MS Neglected winforms controls in a rush to get the product out,
> > they
> > > are lacking so many requirements !

> > > How do i write the handler for it, I have tried the following but it
> does
> > > not work:

> > > Private Sub orderRowChanging(ByVal sender As System.Object, ByVal e As
> > > DsOrders.tblOrdersRowChangeEvent) Handles DataGrid1.CurrentCellChanged

> > > It says the signature doesnt match for either the cellchanged or the
> > > navigate event

> > > Colin


in

> > > > Hi Colin,
> > > > Have you tried handling the ColumnChanging event of the table the
grid
> > is
> > > > bound to? This will let you know when the value changes but only
after
> > you
> > > > move off the cell with the checkbox. (you might also want to handle
> > > > RowChanging as well).
> > > > If you want to find out that the checkbox has changed, but the
change
> > > hasn't
> > > > been committed to the table yet then you need to do a little more
> work.
> > > > There is an example of this at
> > > > http://www.*-*-*.com/ #q874q

> > > > Our BooleanColumn provides an event when the value is changed and is
> > also
> > > > considerably more flexible than the standard DataGridBoolColumn, you
> can
> > > > check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

> > > > I hope some of this helps you
> > > > J.

> > > > Jasmine
> > > > www.datagridcolumnstyles.net
> > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > DataGrid


> > > > > How/Where do I determine if a checkbox column in a winforms
datagrid
> > > edit
> > > > > has been changed to true and run some code if it has?

> > > > > Colin



Mon, 31 Jan 2005 23:20:27 GMT  
 Trapping checkbox = true in a datagrid ?
your code works as expected on my machine, Does the with events need to be
after the windows generated region as it is not in my code

Colin



Quote:
> Colin,
> I'm not sure why your code isn't working, it looks as if it should.
> I've done a quick test just using a DataTable built in the form.
> If you'd like to try this just create a new form and add a datagrid and a
> button then paste this code just after the Designer Generated code region.
> Press the Button to load the grid with the data and the output window
should
> fill up with the events as you change values in the grid.
> I've noticed that the datagridboolcolumn fires columnchanging events even
> when the column hasn't actually changed, particularly when you highlight a
> checkbox and the use the scrollbar.
> I'll look into that further.

> here's the code
> Private WithEvents myDataTable As New DataTable("Test")
> Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles Button1.Click
> DataGrid1.DataSource = myDataTable
> End Sub
> Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
> myDataTable.Columns.Add("Forename", System.Type.GetType("System.String"))
> myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))
> myDataTable.Columns.Add("Lastname", System.Type.GetType("System.String"))
> myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
> myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
> myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
> myDataTable.AcceptChanges()
> End Sub
> Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> DataRowChangeEventArgs) Handles myDataTable.RowChanging
> Console.WriteLine("RowChanging")
> End Sub
> Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
> Console.WriteLine("ColumnChanging")
> End Sub

> J.

> Jasmine
> www.datagridcolumnstyles.net
> Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid


> > I can compile ok but the de{*filter*} never gets to the event after I edit
> > datagrid and move to a new row , or even if I save changes back to
> database
> > any ideas ?

> > I have in my declarations section:
> > Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> > then a sub declared as below , my Datagrid is bound to the table
> > dsOrders.tblOrders

> > Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As Object,
> > ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> > event_tblorders.tblOrdersRowChanging

> > 'detects changes to planned checkbox when record is moved

> > MsgBox(e.Row.Item("planned"))

> > End Sub

> > I got the ide to create the handler after creating the event in the
> > declarations section so I am sure it is correct syntax, Datagrid1 is
bound
> > to dsOrders.tblOrders am I missing something Here

> > Colin



> > > Colin
> > > You are mixing up the RowChanging handler and the CurrentCellChanged
> > > handler.
> > > The RowChanging and ColumnChanging events are raised by the DataTable
> that
> > > contains the data showing in the grid. Remember these events only fire
> as
> > > the change is being committed to the table, not everytime it changes
in
> > the
> > > cell.

> > > The handlers should be defined like this, bearing in mind that they
are
> > > handling events from a DataTable.

> > > Private Sub myRowChanging( sender as Object,  e as
> DataRowChangeEventArgs)
> > > Handles myTable.RowChanging

> > > End Sub

> > > Private Sub myColumnChanging(sender as Object, e as
> > > DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> > > End Sub

> > > then inside the handlers you can get access to the current row through
> the
> > > e.Row property.

> > > I apologize if these handlers aren't quite correct, I'm a C# developer
> > > really and I'm just writing these off the top of my head so my syntax
> > might
> > > be slightly off, I'm not sure if you need the ByVal keyword before the
> > > parameters. If they don't work, post back and I'll do them in code and
> get
> > > them right !!

> > > J.

> > > Jasmine
> > > www.datagridcolumnstyles.net
> > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> DataGrid


> > > > the rowchanging event will work fine in this app but I can see the
> need
> > to
> > > > purchase some decent controls growing  the more i get into this
> project.
> > > it
> > > > seems MS Neglected winforms controls in a rush to get the product
out,
> > > they
> > > > are lacking so many requirements !

> > > > How do i write the handler for it, I have tried the following but it
> > does
> > > > not work:

> > > > Private Sub orderRowChanging(ByVal sender As System.Object, ByVal e
As
> > > > DsOrders.tblOrdersRowChangeEvent) Handles

DataGrid1.CurrentCellChanged

- Show quoted text -

Quote:

> > > > It says the signature doesnt match for either the cellchanged or the
> > > > navigate event

> > > > Colin


> in

> > > > > Hi Colin,
> > > > > Have you tried handling the ColumnChanging event of the table the
> grid
> > > is
> > > > > bound to? This will let you know when the value changes but only
> after
> > > you
> > > > > move off the cell with the checkbox. (you might also want to
handle
> > > > > RowChanging as well).
> > > > > If you want to find out that the checkbox has changed, but the
> change
> > > > hasn't
> > > > > been committed to the table yet then you need to do a little more
> > work.
> > > > > There is an example of this at
> > > > > http://www.*-*-*.com/ #q874q

> > > > > Our BooleanColumn provides an event when the value is changed and
is
> > > also
> > > > > considerably more flexible than the standard DataGridBoolColumn,
you
> > can
> > > > > check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

> > > > > I hope some of this helps you
> > > > > J.

> > > > > Jasmine
> > > > > www.datagridcolumnstyles.net
> > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > > DataGrid


> > > > > > How/Where do I determine if a checkbox column in a winforms
> datagrid
> > > > edit
> > > > > > has been changed to true and run some code if it has?

> > > > > > Colin



Mon, 31 Jan 2005 23:34:50 GMT  
 Trapping checkbox = true in a datagrid ?
Jasmine

I edited your code to bind to a dataset containing a single table of orders
and the events no longer fire (do you think this is a bug in bound
datagrids)

edited code snippetts

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

DataGrid1.DataSource = Dsform11.tblOrders

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

myDataTable.Columns.Add("Forename", System.Type.GetType("System.String"))

myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))

myDataTable.Columns.Add("Lastname", System.Type.GetType("System.String"))

myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})

myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})

myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})

myDataTable.AcceptChanges()

SqlDataAdapter1.Fill(Dsform11)

End Sub

Quote:

> your code works as expected on my machine, Does the with events need to be
> after the windows generated region as it is not in my code

> Colin



> > Colin,
> > I'm not sure why your code isn't working, it looks as if it should.
> > I've done a quick test just using a DataTable built in the form.
> > If you'd like to try this just create a new form and add a datagrid and
a
> > button then paste this code just after the Designer Generated code
region.
> > Press the Button to load the grid with the data and the output window
> should
> > fill up with the events as you change values in the grid.
> > I've noticed that the datagridboolcolumn fires columnchanging events
even
> > when the column hasn't actually changed, particularly when you highlight
a
> > checkbox and the use the scrollbar.
> > I'll look into that further.

> > here's the code
> > Private WithEvents myDataTable As New DataTable("Test")
> > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles Button1.Click
> > DataGrid1.DataSource = myDataTable
> > End Sub
> > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles MyBase.Load
> > myDataTable.Columns.Add("Forename",

System.Type.GetType("System.String"))
Quote:
> > myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))
> > myDataTable.Columns.Add("Lastname",

System.Type.GetType("System.String"))

- Show quoted text -

Quote:
> > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
> > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
> > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
> > myDataTable.AcceptChanges()
> > End Sub
> > Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> > DataRowChangeEventArgs) Handles myDataTable.RowChanging
> > Console.WriteLine("RowChanging")
> > End Sub
> > Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> > DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
> > Console.WriteLine("ColumnChanging")
> > End Sub

> > J.

> > Jasmine
> > www.datagridcolumnstyles.net
> > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
DataGrid


> > > I can compile ok but the de{*filter*} never gets to the event after I edit
> > > datagrid and move to a new row , or even if I save changes back to
> > database
> > > any ideas ?

> > > I have in my declarations section:
> > > Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> > > then a sub declared as below , my Datagrid is bound to the table
> > > dsOrders.tblOrders

> > > Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As
Object,
> > > ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> > > event_tblorders.tblOrdersRowChanging

> > > 'detects changes to planned checkbox when record is moved

> > > MsgBox(e.Row.Item("planned"))

> > > End Sub

> > > I got the ide to create the handler after creating the event in the
> > > declarations section so I am sure it is correct syntax, Datagrid1 is
> bound
> > > to dsOrders.tblOrders am I missing something Here

> > > Colin


in

> > > > Colin
> > > > You are mixing up the RowChanging handler and the CurrentCellChanged
> > > > handler.
> > > > The RowChanging and ColumnChanging events are raised by the
DataTable
> > that
> > > > contains the data showing in the grid. Remember these events only
fire
> > as
> > > > the change is being committed to the table, not everytime it changes
> in
> > > the
> > > > cell.

> > > > The handlers should be defined like this, bearing in mind that they
> are
> > > > handling events from a DataTable.

> > > > Private Sub myRowChanging( sender as Object,  e as
> > DataRowChangeEventArgs)
> > > > Handles myTable.RowChanging

> > > > End Sub

> > > > Private Sub myColumnChanging(sender as Object, e as
> > > > DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> > > > End Sub

> > > > then inside the handlers you can get access to the current row
through
> > the
> > > > e.Row property.

> > > > I apologize if these handlers aren't quite correct, I'm a C#
developer
> > > > really and I'm just writing these off the top of my head so my
syntax
> > > might
> > > > be slightly off, I'm not sure if you need the ByVal keyword before
the
> > > > parameters. If they don't work, post back and I'll do them in code
and
> > get
> > > > them right !!

> > > > J.

> > > > Jasmine
> > > > www.datagridcolumnstyles.net
> > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > DataGrid


> > > > > the rowchanging event will work fine in this app but I can see the
> > need
> > > to
> > > > > purchase some decent controls growing  the more i get into this
> > project.
> > > > it
> > > > > seems MS Neglected winforms controls in a rush to get the product
> out,
> > > > they
> > > > > are lacking so many requirements !

> > > > > How do i write the handler for it, I have tried the following but
it
> > > does
> > > > > not work:

> > > > > Private Sub orderRowChanging(ByVal sender As System.Object, ByVal
e
> As
> > > > > DsOrders.tblOrdersRowChangeEvent) Handles
> DataGrid1.CurrentCellChanged

> > > > > It says the signature doesnt match for either the cellchanged or
the
> > > > > navigate event

> > > > > Colin


wrote
> > in

> > > > > > Hi Colin,
> > > > > > Have you tried handling the ColumnChanging event of the table
the
> > grid
> > > > is
> > > > > > bound to? This will let you know when the value changes but only
> > after
> > > > you
> > > > > > move off the cell with the checkbox. (you might also want to
> handle
> > > > > > RowChanging as well).
> > > > > > If you want to find out that the checkbox has changed, but the
> > change
> > > > > hasn't
> > > > > > been committed to the table yet then you need to do a little
more
> > > work.
> > > > > > There is an example of this at
> > > > > > http://www.*-*-*.com/ #q874q

> > > > > > Our BooleanColumn provides an event when the value is changed
and
> is
> > > > also
> > > > > > considerably more flexible than the standard DataGridBoolColumn,
> you
> > > can
> > > > > > check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

> > > > > > I hope some of this helps you
> > > > > > J.

> > > > > > Jasmine
> > > > > > www.datagridcolumnstyles.net
> > > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > > > DataGrid


> > > > > > > How/Where do I determine if a checkbox column in a winforms
> > datagrid
> > > > > edit
> > > > > > > has been changed to true and run some code if it has?

> > > > > > > Colin



Mon, 31 Jan 2005 23:48:13 GMT  
 Trapping checkbox = true in a datagrid ?
No, I only moved down it below there so you could just paste the entire code
straight in.
It works OK when it's above it as well.

I'm still not too sure why your code isn't working though. Like I said
earlier I'm not really a VB.Net person but I wonder if the Handles part of
this code shouldn't be Handles event_tblorders.RowChanging

Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As Object,
ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
event_tblorders.tblOrdersRowChanging

just a thought - it doesn't look right because the handler should be
handling the RowChanging event of the event_tblorders object, but instead
this suggests to me that it is handling another event called
tblOrderRowChanging

can you try changing the Handles part and see if it works, or even compiles
:-)

J.

Jasmine
www.datagridcolumnstyles.net
Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid

Quote:

> your code works as expected on my machine, Does the with events need to be
> after the windows generated region as it is not in my code

> Colin



> > Colin,
> > I'm not sure why your code isn't working, it looks as if it should.
> > I've done a quick test just using a DataTable built in the form.
> > If you'd like to try this just create a new form and add a datagrid and
a
> > button then paste this code just after the Designer Generated code
region.
> > Press the Button to load the grid with the data and the output window
> should
> > fill up with the events as you change values in the grid.
> > I've noticed that the datagridboolcolumn fires columnchanging events
even
> > when the column hasn't actually changed, particularly when you highlight
a
> > checkbox and the use the scrollbar.
> > I'll look into that further.

> > here's the code
> > Private WithEvents myDataTable As New DataTable("Test")
> > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles Button1.Click
> > DataGrid1.DataSource = myDataTable
> > End Sub
> > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles MyBase.Load
> > myDataTable.Columns.Add("Forename",

System.Type.GetType("System.String"))
Quote:
> > myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))
> > myDataTable.Columns.Add("Lastname",

System.Type.GetType("System.String"))

- Show quoted text -

Quote:
> > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
> > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
> > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
> > myDataTable.AcceptChanges()
> > End Sub
> > Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> > DataRowChangeEventArgs) Handles myDataTable.RowChanging
> > Console.WriteLine("RowChanging")
> > End Sub
> > Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> > DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
> > Console.WriteLine("ColumnChanging")
> > End Sub

> > J.

> > Jasmine
> > www.datagridcolumnstyles.net
> > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
DataGrid


> > > I can compile ok but the de{*filter*} never gets to the event after I edit
> > > datagrid and move to a new row , or even if I save changes back to
> > database
> > > any ideas ?

> > > I have in my declarations section:
> > > Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> > > then a sub declared as below , my Datagrid is bound to the table
> > > dsOrders.tblOrders

> > > Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As
Object,
> > > ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> > > event_tblorders.tblOrdersRowChanging

> > > 'detects changes to planned checkbox when record is moved

> > > MsgBox(e.Row.Item("planned"))

> > > End Sub

> > > I got the ide to create the handler after creating the event in the
> > > declarations section so I am sure it is correct syntax, Datagrid1 is
> bound
> > > to dsOrders.tblOrders am I missing something Here

> > > Colin


in

> > > > Colin
> > > > You are mixing up the RowChanging handler and the CurrentCellChanged
> > > > handler.
> > > > The RowChanging and ColumnChanging events are raised by the
DataTable
> > that
> > > > contains the data showing in the grid. Remember these events only
fire
> > as
> > > > the change is being committed to the table, not everytime it changes
> in
> > > the
> > > > cell.

> > > > The handlers should be defined like this, bearing in mind that they
> are
> > > > handling events from a DataTable.

> > > > Private Sub myRowChanging( sender as Object,  e as
> > DataRowChangeEventArgs)
> > > > Handles myTable.RowChanging

> > > > End Sub

> > > > Private Sub myColumnChanging(sender as Object, e as
> > > > DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> > > > End Sub

> > > > then inside the handlers you can get access to the current row
through
> > the
> > > > e.Row property.

> > > > I apologize if these handlers aren't quite correct, I'm a C#
developer
> > > > really and I'm just writing these off the top of my head so my
syntax
> > > might
> > > > be slightly off, I'm not sure if you need the ByVal keyword before
the
> > > > parameters. If they don't work, post back and I'll do them in code
and
> > get
> > > > them right !!

> > > > J.

> > > > Jasmine
> > > > www.datagridcolumnstyles.net
> > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > DataGrid


> > > > > the rowchanging event will work fine in this app but I can see the
> > need
> > > to
> > > > > purchase some decent controls growing  the more i get into this
> > project.
> > > > it
> > > > > seems MS Neglected winforms controls in a rush to get the product
> out,
> > > > they
> > > > > are lacking so many requirements !

> > > > > How do i write the handler for it, I have tried the following but
it
> > > does
> > > > > not work:

> > > > > Private Sub orderRowChanging(ByVal sender As System.Object, ByVal
e
> As
> > > > > DsOrders.tblOrdersRowChangeEvent) Handles
> DataGrid1.CurrentCellChanged

> > > > > It says the signature doesnt match for either the cellchanged or
the
> > > > > navigate event

> > > > > Colin


wrote
> > in

> > > > > > Hi Colin,
> > > > > > Have you tried handling the ColumnChanging event of the table
the
> > grid
> > > > is
> > > > > > bound to? This will let you know when the value changes but only
> > after
> > > > you
> > > > > > move off the cell with the checkbox. (you might also want to
> handle
> > > > > > RowChanging as well).
> > > > > > If you want to find out that the checkbox has changed, but the
> > change
> > > > > hasn't
> > > > > > been committed to the table yet then you need to do a little
more
> > > work.
> > > > > > There is an example of this at
> > > > > > http://www.*-*-*.com/ #q874q

> > > > > > Our BooleanColumn provides an event when the value is changed
and
> is
> > > > also
> > > > > > considerably more flexible than the standard DataGridBoolColumn,
> you
> > > can
> > > > > > check it out at www.datagridcolumnstyles.net/suiteIIboolean.asp.

> > > > > > I hope some of this helps you
> > > > > > J.

> > > > > > Jasmine
> > > > > > www.datagridcolumnstyles.net
> > > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > > > DataGrid


> > > > > > > How/Where do I determine if a checkbox column in a winforms
> > datagrid
> > > > > edit
> > > > > > > has been changed to true and run some code if it has?

> > > > > > > Colin



Mon, 31 Jan 2005 23:48:40 GMT  
 Trapping checkbox = true in a datagrid ?
Colin,
I don't think the events issue is a bug, but I think to resolve the problem
we will need to step back a little and try to find some common ground so we
can both have the same data. Do you have the NorthWind database installed?
We can use the Orders table from that and then we should be able to get to a
working solution. I don't see a table with a column suitable for binding to
the DataGridBoolColumn but all we want to do is get these events working,
right?

Is that OK for you - if it is I'll get another small test app made up and we
can compare results.

J.

Jasmine
www.datagridcolumnstyles.net
Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid

Quote:

> Jasmine

> I edited your code to bind to a dataset containing a single table of
orders
> and the events no longer fire (do you think this is a bug in bound
> datagrids)

> edited code snippetts

> Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles Button1.Click

> DataGrid1.DataSource = Dsform11.tblOrders

> End Sub

> Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load

> myDataTable.Columns.Add("Forename", System.Type.GetType("System.String"))

> myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))

> myDataTable.Columns.Add("Lastname", System.Type.GetType("System.String"))

> myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})

> myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})

> myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})

> myDataTable.AcceptChanges()

> SqlDataAdapter1.Fill(Dsform11)

> End Sub


> > your code works as expected on my machine, Does the with events need to
be
> > after the windows generated region as it is not in my code

> > Colin



> > > Colin,
> > > I'm not sure why your code isn't working, it looks as if it should.
> > > I've done a quick test just using a DataTable built in the form.
> > > If you'd like to try this just create a new form and add a datagrid
and
> a
> > > button then paste this code just after the Designer Generated code
> region.
> > > Press the Button to load the grid with the data and the output window
> > should
> > > fill up with the events as you change values in the grid.
> > > I've noticed that the datagridboolcolumn fires columnchanging events
> even
> > > when the column hasn't actually changed, particularly when you
highlight
> a
> > > checkbox and the use the scrollbar.
> > > I'll look into that further.

> > > here's the code
> > > Private WithEvents myDataTable As New DataTable("Test")
> > > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > > System.EventArgs) Handles Button1.Click
> > > DataGrid1.DataSource = myDataTable
> > > End Sub
> > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > System.EventArgs) Handles MyBase.Load
> > > myDataTable.Columns.Add("Forename",
> System.Type.GetType("System.String"))
> > > myDataTable.Columns.Add("Status",

System.Type.GetType("System.Boolean"))

- Show quoted text -

Quote:
> > > myDataTable.Columns.Add("Lastname",
> System.Type.GetType("System.String"))
> > > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
> > > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
> > > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
> > > myDataTable.AcceptChanges()
> > > End Sub
> > > Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> > > DataRowChangeEventArgs) Handles myDataTable.RowChanging
> > > Console.WriteLine("RowChanging")
> > > End Sub
> > > Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> > > DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
> > > Console.WriteLine("ColumnChanging")
> > > End Sub

> > > J.

> > > Jasmine
> > > www.datagridcolumnstyles.net
> > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> DataGrid


> > > > I can compile ok but the de{*filter*} never gets to the event after I
edit
> > > > datagrid and move to a new row , or even if I save changes back to
> > > database
> > > > any ideas ?

> > > > I have in my declarations section:
> > > > Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> > > > then a sub declared as below , my Datagrid is bound to the table
> > > > dsOrders.tblOrders

> > > > Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As
> Object,
> > > > ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> > > > event_tblorders.tblOrdersRowChanging

> > > > 'detects changes to planned checkbox when record is moved

> > > > MsgBox(e.Row.Item("planned"))

> > > > End Sub

> > > > I got the ide to create the handler after creating the event in the
> > > > declarations section so I am sure it is correct syntax, Datagrid1 is
> > bound
> > > > to dsOrders.tblOrders am I missing something Here

> > > > Colin


> in

> > > > > Colin
> > > > > You are mixing up the RowChanging handler and the
CurrentCellChanged
> > > > > handler.
> > > > > The RowChanging and ColumnChanging events are raised by the
> DataTable
> > > that
> > > > > contains the data showing in the grid. Remember these events only
> fire
> > > as
> > > > > the change is being committed to the table, not everytime it
changes
> > in
> > > > the
> > > > > cell.

> > > > > The handlers should be defined like this, bearing in mind that
they
> > are
> > > > > handling events from a DataTable.

> > > > > Private Sub myRowChanging( sender as Object,  e as
> > > DataRowChangeEventArgs)
> > > > > Handles myTable.RowChanging

> > > > > End Sub

> > > > > Private Sub myColumnChanging(sender as Object, e as
> > > > > DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> > > > > End Sub

> > > > > then inside the handlers you can get access to the current row
> through
> > > the
> > > > > e.Row property.

> > > > > I apologize if these handlers aren't quite correct, I'm a C#
> developer
> > > > > really and I'm just writing these off the top of my head so my
> syntax
> > > > might
> > > > > be slightly off, I'm not sure if you need the ByVal keyword before
> the
> > > > > parameters. If they don't work, post back and I'll do them in code
> and
> > > get
> > > > > them right !!

> > > > > J.

> > > > > Jasmine
> > > > > www.datagridcolumnstyles.net
> > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > > DataGrid


> > > > > > the rowchanging event will work fine in this app but I can see
the
> > > need
> > > > to
> > > > > > purchase some decent controls growing  the more i get into this
> > > project.
> > > > > it
> > > > > > seems MS Neglected winforms controls in a rush to get the
product
> > out,
> > > > > they
> > > > > > are lacking so many requirements !

> > > > > > How do i write the handler for it, I have tried the following
but
> it
> > > > does
> > > > > > not work:

> > > > > > Private Sub orderRowChanging(ByVal sender As System.Object,
ByVal
> e
> > As
> > > > > > DsOrders.tblOrdersRowChangeEvent) Handles
> > DataGrid1.CurrentCellChanged

> > > > > > It says the signature doesnt match for either the cellchanged or
> the
> > > > > > navigate event

> > > > > > Colin


> wrote
> > > in

> > > > > > > Hi Colin,
> > > > > > > Have you tried handling the ColumnChanging event of the table
> the
> > > grid
> > > > > is
> > > > > > > bound to? This will let you know when the value changes but
only
> > > after
> > > > > you
> > > > > > > move off the cell with the checkbox. (you might also want to
> > handle
> > > > > > > RowChanging as well).
> > > > > > > If you want to find out that the checkbox has changed, but the
> > > change
> > > > > > hasn't
> > > > > > > been committed to the table yet then you need to do a little
> more
> > > > work.
> > > > > > > There is an example of this at
> > > > > > > http://www.*-*-*.com/ #q874q

> > > > > > > Our BooleanColumn provides an event when the value is changed
> and
> > is
> > > > > also
> > > > > > > considerably more flexible than the standard
DataGridBoolColumn,
> > you
> > > > can
> > > > > > > check it out at

www.datagridcolumnstyles.net/suiteIIboolean.asp.

- Show quoted text -

Quote:

> > > > > > > I hope some of this helps you
> > > > > > > J.

> > > > > > > Jasmine
> > > > > > > www.datagridcolumnstyles.net
> > > > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows
Forms
> > > > > DataGrid


> > > > > > > > How/Where do I determine if a checkbox column in a winforms
> > > datagrid
> > > > > > edit
> > > > > > > > has been changed to true and run some code if it has?

> > > > > > > > Colin



Tue, 01 Feb 2005 00:14:31 GMT  
 Trapping checkbox = true in a datagrid ?
Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As Object,
ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
event_tblorders.tblOrdersRowChanging

tried it still not working.

Ok with suggestion for nowthwind orders, I am getting it from sql2000



Quote:
> No, I only moved down it below there so you could just paste the entire
code
> straight in.
> It works OK when it's above it as well.

> I'm still not too sure why your code isn't working though. Like I said
> earlier I'm not really a VB.Net person but I wonder if the Handles part of
> this code shouldn't be Handles event_tblorders.RowChanging

> Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As Object,
> ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> event_tblorders.tblOrdersRowChanging

> just a thought - it doesn't look right because the handler should be
> handling the RowChanging event of the event_tblorders object, but instead
> this suggests to me that it is handling another event called
> tblOrderRowChanging

> can you try changing the Handles part and see if it works, or even
compiles
> :-)

> J.

> Jasmine
> www.datagridcolumnstyles.net
> Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid


> > your code works as expected on my machine, Does the with events need to
be
> > after the windows generated region as it is not in my code

> > Colin



> > > Colin,
> > > I'm not sure why your code isn't working, it looks as if it should.
> > > I've done a quick test just using a DataTable built in the form.
> > > If you'd like to try this just create a new form and add a datagrid
and
> a
> > > button then paste this code just after the Designer Generated code
> region.
> > > Press the Button to load the grid with the data and the output window
> > should
> > > fill up with the events as you change values in the grid.
> > > I've noticed that the datagridboolcolumn fires columnchanging events
> even
> > > when the column hasn't actually changed, particularly when you
highlight
> a
> > > checkbox and the use the scrollbar.
> > > I'll look into that further.

> > > here's the code
> > > Private WithEvents myDataTable As New DataTable("Test")
> > > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > > System.EventArgs) Handles Button1.Click
> > > DataGrid1.DataSource = myDataTable
> > > End Sub
> > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > System.EventArgs) Handles MyBase.Load
> > > myDataTable.Columns.Add("Forename",
> System.Type.GetType("System.String"))
> > > myDataTable.Columns.Add("Status",

System.Type.GetType("System.Boolean"))

- Show quoted text -

Quote:
> > > myDataTable.Columns.Add("Lastname",
> System.Type.GetType("System.String"))
> > > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
> > > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
> > > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
> > > myDataTable.AcceptChanges()
> > > End Sub
> > > Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> > > DataRowChangeEventArgs) Handles myDataTable.RowChanging
> > > Console.WriteLine("RowChanging")
> > > End Sub
> > > Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> > > DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
> > > Console.WriteLine("ColumnChanging")
> > > End Sub

> > > J.

> > > Jasmine
> > > www.datagridcolumnstyles.net
> > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> DataGrid


> > > > I can compile ok but the de{*filter*} never gets to the event after I
edit
> > > > datagrid and move to a new row , or even if I save changes back to
> > > database
> > > > any ideas ?

> > > > I have in my declarations section:
> > > > Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> > > > then a sub declared as below , my Datagrid is bound to the table
> > > > dsOrders.tblOrders

> > > > Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As
> Object,
> > > > ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> > > > event_tblorders.tblOrdersRowChanging

> > > > 'detects changes to planned checkbox when record is moved

> > > > MsgBox(e.Row.Item("planned"))

> > > > End Sub

> > > > I got the ide to create the handler after creating the event in the
> > > > declarations section so I am sure it is correct syntax, Datagrid1 is
> > bound
> > > > to dsOrders.tblOrders am I missing something Here

> > > > Colin


> in

> > > > > Colin
> > > > > You are mixing up the RowChanging handler and the
CurrentCellChanged
> > > > > handler.
> > > > > The RowChanging and ColumnChanging events are raised by the
> DataTable
> > > that
> > > > > contains the data showing in the grid. Remember these events only
> fire
> > > as
> > > > > the change is being committed to the table, not everytime it
changes
> > in
> > > > the
> > > > > cell.

> > > > > The handlers should be defined like this, bearing in mind that
they
> > are
> > > > > handling events from a DataTable.

> > > > > Private Sub myRowChanging( sender as Object,  e as
> > > DataRowChangeEventArgs)
> > > > > Handles myTable.RowChanging

> > > > > End Sub

> > > > > Private Sub myColumnChanging(sender as Object, e as
> > > > > DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> > > > > End Sub

> > > > > then inside the handlers you can get access to the current row
> through
> > > the
> > > > > e.Row property.

> > > > > I apologize if these handlers aren't quite correct, I'm a C#
> developer
> > > > > really and I'm just writing these off the top of my head so my
> syntax
> > > > might
> > > > > be slightly off, I'm not sure if you need the ByVal keyword before
> the
> > > > > parameters. If they don't work, post back and I'll do them in code
> and
> > > get
> > > > > them right !!

> > > > > J.

> > > > > Jasmine
> > > > > www.datagridcolumnstyles.net
> > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > > DataGrid


> > > > > > the rowchanging event will work fine in this app but I can see
the
> > > need
> > > > to
> > > > > > purchase some decent controls growing  the more i get into this
> > > project.
> > > > > it
> > > > > > seems MS Neglected winforms controls in a rush to get the
product
> > out,
> > > > > they
> > > > > > are lacking so many requirements !

> > > > > > How do i write the handler for it, I have tried the following
but
> it
> > > > does
> > > > > > not work:

> > > > > > Private Sub orderRowChanging(ByVal sender As System.Object,
ByVal
> e
> > As
> > > > > > DsOrders.tblOrdersRowChangeEvent) Handles
> > DataGrid1.CurrentCellChanged

> > > > > > It says the signature doesnt match for either the cellchanged or
> the
> > > > > > navigate event

> > > > > > Colin


> wrote
> > > in

> > > > > > > Hi Colin,
> > > > > > > Have you tried handling the ColumnChanging event of the table
> the
> > > grid
> > > > > is
> > > > > > > bound to? This will let you know when the value changes but
only
> > > after
> > > > > you
> > > > > > > move off the cell with the checkbox. (you might also want to
> > handle
> > > > > > > RowChanging as well).
> > > > > > > If you want to find out that the checkbox has changed, but the
> > > change
> > > > > > hasn't
> > > > > > > been committed to the table yet then you need to do a little
> more
> > > > work.
> > > > > > > There is an example of this at
> > > > > > > http://www.*-*-*.com/ #q874q

> > > > > > > Our BooleanColumn provides an event when the value is changed
> and
> > is
> > > > > also
> > > > > > > considerably more flexible than the standard
DataGridBoolColumn,
> > you
> > > > can
> > > > > > > check it out at

www.datagridcolumnstyles.net/suiteIIboolean.asp.

- Show quoted text -

Quote:

> > > > > > > I hope some of this helps you
> > > > > > > J.

> > > > > > > Jasmine
> > > > > > > www.datagridcolumnstyles.net
> > > > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows
Forms
> > > > > DataGrid


> > > > > > > > How/Where do I determine if a checkbox column in a winforms
> > > datagrid
> > > > > > edit
> > > > > > > > has been changed to true and run some code if it has?

> > > > > > > > Colin



Tue, 01 Feb 2005 00:49:49 GMT  
 Trapping checkbox = true in a datagrid ?
heres my code for the northwind table:

added to form with datagrid and button again and its still not working

Colin

Private WithEvents myDataTable As dsform1.OrdersDataTable

' this may be the problem as the dataset on the form is dsform11 an instance
of dsform1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

DataGrid1.DataSource = Dsform11.Orders

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

'myDataTable.Columns.Add("Forename", System.Type.GetType("System.String"))

'myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))

'myDataTable.Columns.Add("Lastname", System.Type.GetType("System.String"))

'myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})

'myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})

'myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})

'myDataTable.AcceptChanges()

SqlDataAdapter1.Fill(Dsform11)

End Sub

Private Sub myRowChanging(ByVal sender As Object, ByVal e As
DataRowChangeEventArgs) Handles myDataTable.RowChanging

Console.WriteLine("RowChanging")

End Sub

Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging

Console.WriteLine("ColumnChanging")

End Sub



Quote:
> Colin,
> I don't think the events issue is a bug, but I think to resolve the
problem
> we will need to step back a little and try to find some common ground so
we
> can both have the same data. Do you have the NorthWind database installed?
> We can use the Orders table from that and then we should be able to get to
a
> working solution. I don't see a table with a column suitable for binding
to
> the DataGridBoolColumn but all we want to do is get these events working,
> right?

> Is that OK for you - if it is I'll get another small test app made up and
we
> can compare results.

> J.

> Jasmine
> www.datagridcolumnstyles.net
> Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid


> > Jasmine

> > I edited your code to bind to a dataset containing a single table of
> orders
> > and the events no longer fire (do you think this is a bug in bound
> > datagrids)

> > edited code snippetts

> > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles Button1.Click

> > DataGrid1.DataSource = Dsform11.tblOrders

> > End Sub

> > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles MyBase.Load

> > myDataTable.Columns.Add("Forename",

System.Type.GetType("System.String"))
Quote:

> > myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))

> > myDataTable.Columns.Add("Lastname",

System.Type.GetType("System.String"))

- Show quoted text -

Quote:

> > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})

> > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})

> > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})

> > myDataTable.AcceptChanges()

> > SqlDataAdapter1.Fill(Dsform11)

> > End Sub


> > > your code works as expected on my machine, Does the with events need
to
> be
> > > after the windows generated region as it is not in my code

> > > Colin


in

> > > > Colin,
> > > > I'm not sure why your code isn't working, it looks as if it should.
> > > > I've done a quick test just using a DataTable built in the form.
> > > > If you'd like to try this just create a new form and add a datagrid
> and
> > a
> > > > button then paste this code just after the Designer Generated code
> > region.
> > > > Press the Button to load the grid with the data and the output
window
> > > should
> > > > fill up with the events as you change values in the grid.
> > > > I've noticed that the datagridboolcolumn fires columnchanging events
> > even
> > > > when the column hasn't actually changed, particularly when you
> highlight
> > a
> > > > checkbox and the use the scrollbar.
> > > > I'll look into that further.

> > > > here's the code
> > > > Private WithEvents myDataTable As New DataTable("Test")
> > > > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > > > System.EventArgs) Handles Button1.Click
> > > > DataGrid1.DataSource = myDataTable
> > > > End Sub
> > > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > > System.EventArgs) Handles MyBase.Load
> > > > myDataTable.Columns.Add("Forename",
> > System.Type.GetType("System.String"))
> > > > myDataTable.Columns.Add("Status",
> System.Type.GetType("System.Boolean"))
> > > > myDataTable.Columns.Add("Lastname",
> > System.Type.GetType("System.String"))
> > > > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
> > > > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
> > > > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
> > > > myDataTable.AcceptChanges()
> > > > End Sub
> > > > Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> > > > DataRowChangeEventArgs) Handles myDataTable.RowChanging
> > > > Console.WriteLine("RowChanging")
> > > > End Sub
> > > > Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> > > > DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
> > > > Console.WriteLine("ColumnChanging")
> > > > End Sub

> > > > J.

> > > > Jasmine
> > > > www.datagridcolumnstyles.net
> > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > DataGrid


> > > > > I can compile ok but the de{*filter*} never gets to the event after I
> edit
> > > > > datagrid and move to a new row , or even if I save changes back to
> > > > database
> > > > > any ideas ?

> > > > > I have in my declarations section:
> > > > > Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> > > > > then a sub declared as below , my Datagrid is bound to the table
> > > > > dsOrders.tblOrders

> > > > > Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As
> > Object,
> > > > > ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> > > > > event_tblorders.tblOrdersRowChanging

> > > > > 'detects changes to planned checkbox when record is moved

> > > > > MsgBox(e.Row.Item("planned"))

> > > > > End Sub

> > > > > I got the ide to create the handler after creating the event in
the
> > > > > declarations section so I am sure it is correct syntax, Datagrid1
is
> > > bound
> > > > > to dsOrders.tblOrders am I missing something Here

> > > > > Colin


wrote
> > in

> > > > > > Colin
> > > > > > You are mixing up the RowChanging handler and the
> CurrentCellChanged
> > > > > > handler.
> > > > > > The RowChanging and ColumnChanging events are raised by the
> > DataTable
> > > > that
> > > > > > contains the data showing in the grid. Remember these events
only
> > fire
> > > > as
> > > > > > the change is being committed to the table, not everytime it
> changes
> > > in
> > > > > the
> > > > > > cell.

> > > > > > The handlers should be defined like this, bearing in mind that
> they
> > > are
> > > > > > handling events from a DataTable.

> > > > > > Private Sub myRowChanging( sender as Object,  e as
> > > > DataRowChangeEventArgs)
> > > > > > Handles myTable.RowChanging

> > > > > > End Sub

> > > > > > Private Sub myColumnChanging(sender as Object, e as
> > > > > > DataColumnChangeEventArgs) Handles myTable.ColumnChanging

> > > > > > End Sub

> > > > > > then inside the handlers you can get access to the current row
> > through
> > > > the
> > > > > > e.Row property.

> > > > > > I apologize if these handlers aren't quite correct, I'm a C#
> > developer
> > > > > > really and I'm just writing these off the top of my head so my
> > syntax
> > > > > might
> > > > > > be slightly off, I'm not sure if you need the ByVal keyword
before
> > the
> > > > > > parameters. If they don't work, post back and I'll do them in
code
> > and
> > > > get
> > > > > > them right !!

> > > > > > J.

> > > > > > Jasmine
> > > > > > www.datagridcolumnstyles.net
> > > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > > > DataGrid


> > > > > > > the rowchanging event will work fine in this app but I can see
> the
> > > > need
> > > > > to
> > > > > > > purchase some decent controls growing  the more i get into
this
> > > > project.
> > > > > > it
> > > > > > > seems MS Neglected winforms controls in a rush to get the
> product
> > > out,
> > > > > > they
> > > > > > > are lacking so many requirements !

> > > > > > > How do i write the handler for it, I have tried the following
> but
> > it
> > > > > does
> > > > > > > not work:

> > > > > > > Private Sub orderRowChanging(ByVal sender As System.Object,
> ByVal
> > e
> > > As
> > > > > > > DsOrders.tblOrdersRowChangeEvent) Handles
> > > DataGrid1.CurrentCellChanged

> > > > > > > It says the signature doesnt match for either the cellchanged
or
> > the
> > > > > > > navigate event

...

read more »



Tue, 01 Feb 2005 01:00:23 GMT  
 Trapping checkbox = true in a datagrid ?
Hi again Colin, sorry about the delay there.
Can I just check that you are handling the events from DSForm11.Orders, the
code you've posted is still handling the events from the myDataTable object
but it should be the events from the DSForm11.Orders object that you bind to
the DataSource property.

Here's what I've got from the Northwind database, I just deleted all the
myDataTable related code and added a sqlConnection and dataAdapter to the
form.

Notice in this case I added the event handlers manually using the AddHandler
keyword

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Me.SqlDataAdapter1.Fill(DataSet11)
AddHandler DataSet11.Orders.ColumnChanging, New
DataColumnChangeEventHandler(AddressOf myColumnChanging)
AddHandler DataSet11.Orders.RowChanging, New
DataRowChangeEventHandler(AddressOf myRowChanging)
DataGrid1.DataSource = Me.DataSet11.Orders
End Sub

Private Sub myRowChanging(ByVal sender As Object, ByVal e As
DataRowChangeEventArgs)
Console.WriteLine("RowChanging " + e.Row.RowState.ToString())
End Sub

Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
DataColumnChangeEventArgs)
Console.WriteLine("ColumnChanging " + e.Row.RowState.ToString())
End Sub

The events are working OK for me, perhaps using the AddHandler method to
link the events to the delegates might make it clearer why you are not
seeing the events.
Let me know if this works for you

J.

Jasmine
www.datagridcolumnstyles.net
Custom DataGridColumnStyles for the Microsoft .Net Windows Forms DataGrid

Quote:

> heres my code for the northwind table:

> added to form with datagrid and button again and its still not working

> Colin

> Private WithEvents myDataTable As dsform1.OrdersDataTable

> ' this may be the problem as the dataset on the form is dsform11 an
instance
> of dsform1

> Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles Button1.Click

> DataGrid1.DataSource = Dsform11.Orders

> End Sub

> Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load

> 'myDataTable.Columns.Add("Forename", System.Type.GetType("System.String"))

> 'myDataTable.Columns.Add("Status", System.Type.GetType("System.Boolean"))

> 'myDataTable.Columns.Add("Lastname", System.Type.GetType("System.String"))

> 'myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})

> 'myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})

> 'myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})

> 'myDataTable.AcceptChanges()

> SqlDataAdapter1.Fill(Dsform11)

> End Sub

> Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> DataRowChangeEventArgs) Handles myDataTable.RowChanging

> Console.WriteLine("RowChanging")

> End Sub

> Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging

> Console.WriteLine("ColumnChanging")

> End Sub



> > Colin,
> > I don't think the events issue is a bug, but I think to resolve the
> problem
> > we will need to step back a little and try to find some common ground so
> we
> > can both have the same data. Do you have the NorthWind database
installed?
> > We can use the Orders table from that and then we should be able to get
to
> a
> > working solution. I don't see a table with a column suitable for binding
> to
> > the DataGridBoolColumn but all we want to do is get these events
working,
> > right?

> > Is that OK for you - if it is I'll get another small test app made up
and
> we
> > can compare results.

> > J.

> > Jasmine
> > www.datagridcolumnstyles.net
> > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
DataGrid


> > > Jasmine

> > > I edited your code to bind to a dataset containing a single table of
> > orders
> > > and the events no longer fire (do you think this is a bug in bound
> > > datagrids)

> > > edited code snippetts

> > > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> > > System.EventArgs) Handles Button1.Click

> > > DataGrid1.DataSource = Dsform11.tblOrders

> > > End Sub

> > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > System.EventArgs) Handles MyBase.Load

> > > myDataTable.Columns.Add("Forename",
> System.Type.GetType("System.String"))

> > > myDataTable.Columns.Add("Status",

System.Type.GetType("System.Boolean"))

- Show quoted text -

Quote:

> > > myDataTable.Columns.Add("Lastname",
> System.Type.GetType("System.String"))

> > > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})

> > > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})

> > > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})

> > > myDataTable.AcceptChanges()

> > > SqlDataAdapter1.Fill(Dsform11)

> > > End Sub


> > > > your code works as expected on my machine, Does the with events need
> to
> > be
> > > > after the windows generated region as it is not in my code

> > > > Colin


> in

> > > > > Colin,
> > > > > I'm not sure why your code isn't working, it looks as if it
should.
> > > > > I've done a quick test just using a DataTable built in the form.
> > > > > If you'd like to try this just create a new form and add a
datagrid
> > and
> > > a
> > > > > button then paste this code just after the Designer Generated code
> > > region.
> > > > > Press the Button to load the grid with the data and the output
> window
> > > > should
> > > > > fill up with the events as you change values in the grid.
> > > > > I've noticed that the datagridboolcolumn fires columnchanging
events
> > > even
> > > > > when the column hasn't actually changed, particularly when you
> > highlight
> > > a
> > > > > checkbox and the use the scrollbar.
> > > > > I'll look into that further.

> > > > > here's the code
> > > > > Private WithEvents myDataTable As New DataTable("Test")
> > > > > Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As
> > > > > System.EventArgs) Handles Button1.Click
> > > > > DataGrid1.DataSource = myDataTable
> > > > > End Sub
> > > > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > > > System.EventArgs) Handles MyBase.Load
> > > > > myDataTable.Columns.Add("Forename",
> > > System.Type.GetType("System.String"))
> > > > > myDataTable.Columns.Add("Status",
> > System.Type.GetType("System.Boolean"))
> > > > > myDataTable.Columns.Add("Lastname",
> > > System.Type.GetType("System.String"))
> > > > > myDataTable.Rows.Add(New Object() {"Mary", True, "Sullivan"})
> > > > > myDataTable.Rows.Add(New Object() {"John", False, "Peterson"})
> > > > > myDataTable.Rows.Add(New Object() {"Jim", True, "Bergman"})
> > > > > myDataTable.AcceptChanges()
> > > > > End Sub
> > > > > Private Sub myRowChanging(ByVal sender As Object, ByVal e As
> > > > > DataRowChangeEventArgs) Handles myDataTable.RowChanging
> > > > > Console.WriteLine("RowChanging")
> > > > > End Sub
> > > > > Private Sub myColumnChanging(ByVal sender As Object, ByVal e As
> > > > > DataColumnChangeEventArgs) Handles myDataTable.ColumnChanging
> > > > > Console.WriteLine("ColumnChanging")
> > > > > End Sub

> > > > > J.

> > > > > Jasmine
> > > > > www.datagridcolumnstyles.net
> > > > > Custom DataGridColumnStyles for the Microsoft .Net Windows Forms
> > > DataGrid


> > > > > > I can compile ok but the de{*filter*} never gets to the event after
I
> > edit
> > > > > > datagrid and move to a new row , or even if I save changes back
to
> > > > > database
> > > > > > any ideas ?

> > > > > > I have in my declarations section:
> > > > > > Public WithEvents event_tblorders As DsOrders.tblOrdersDataTable

> > > > > > then a sub declared as below , my Datagrid is bound to the table
> > > > > > dsOrders.tblOrders

> > > > > > Private Sub event_tblorders_tblOrdersRowChanging(ByVal sender As
> > > Object,
> > > > > > ByVal e As CRM.dsOrders.tblOrdersRowChangeEvent) Handles
> > > > > > event_tblorders.tblOrdersRowChanging

> > > > > > 'detects changes to planned checkbox when record is moved

> > > > > > MsgBox(e.Row.Item("planned"))

> > > > > > End Sub

> > > > > > I got the ide to create the handler after creating the event in
> the
> > > > > > declarations section so I am sure it is correct syntax,
Datagrid1
> is
> > > > bound
> > > > > > to dsOrders.tblOrders am I missing something Here

> > > > > > Colin


> wrote
> > > in

> > > > > > > Colin
> > > > > > > You are mixing up the RowChanging handler and the
> > CurrentCellChanged
> > > > > > > handler.
> > > > > > > The RowChanging and ColumnChanging events are raised by the
> > > DataTable
> > > > > that
> > > > > > > contains the data showing in the grid. Remember these events
> only
> > > fire
> > > > > as
> > > > > > > the change is being committed to the table, not everytime it
> > changes
> > > > in
> > > > > > the
> > > > > > > cell.

> > > > > > > The handlers should be defined like this, bearing in mind that
> > they
> > > > are

...

read more »



Tue, 01 Feb 2005 01:42:29 GMT  
 
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