> When I try to add a node to a treeview from a different thread, I get an
> error, and it tells me to use the Control.Invoke method.

> How do I use this? Or are there any other ways to do it?

> Thanks

> Sam

> The Windows Forms controls are thread-affiliated. You can't access a
> control's handler with another thread that doesn't create it. You may need
> to call the Invoke method of the control to access the control from anoher
> thread, or you can use the MethodInvoker class to do it.

> David Yuan
> This posting is provided "AS IS" with no warranties, and confers no
rights.
> "Got .Net?  http://www.gotdotnet.com".

> That's what they all say

> I have still to find an example which illustrates how to use Invoke
> correctly, and have it work in this context.

> Any ideas anyone?

> > The Windows Forms controls are thread-affiliated. You can't access a
> > control's handler with another thread that doesn't create it. You may
need
> > to call the Invoke method of the control to access the control from
anoher
> > thread, or you can use the MethodInvoker class to do it.

> > David Yuan
> > This posting is provided "AS IS" with no warranties, and confers no
> rights.
> > "Got .Net?  http://www.gotdotnet.com".

> The documentation on it is poor, and is confusing. however i managed to
get
> it working as follows:

> ' At the top of my form I declare the invoker sub:
> Public Delegate Sub TreeInvoker(ByVal key As String)

> ' When I want to add a tree node from within a worker thread,
> ' I call the invoker sub as follows, always passing the params as an
> ' array even when there's only one.
> Dim params() As Object = {key}
> Me.Invoke(New TreeInvoker(AddressOf Me.AddClientNode), params)

> ' This is the GUI sub
> Private Sub AddClientNode(ByVal key As String)
>     Dim n As New Infragistics.Win.UltraWinTree.UltraTreeNode()
>     n.Text = key
>     n.LeftImages.Add(3)
>     n.Key = key
>     n.Selected = False
>     ultTree.Nodes.Add(n)
> End Sub

> Sam