Using the backgroundworke r to populate a treeview

[john wright]

I have my code done to populate a treeview, but when I move it to the
backgroundworke r I get an error "Action being performed on this control is
being called from the wrong thread. Marshal to the correct thread using
Control.Invoke or Control.BeginIn voke to perform this action (code to
follow). What am I doing wrong. I moved the LoadWIP function to the
backgroundworke r DoWork method instead of calling the sub, but got the same
problem. I am trying to get the background worker to load the treeview then
I will have another background worker maintain the treeview by removing and
adding nodes to the tree every minute. Any help would be appreciated.

John
Private Sub BackgroundWorke r1_DoWork(ByVal sender As System.Object, ByVal e
As System.Componen tModel.DoWorkEv entArgs) Handles BackgroundWorke r1.DoWork

LoadWIP()

'load the steps

' LoadWIPParts(ds .Tables(0))

End Sub

Private Sub LoadWIP()

Dim ds As New DataSet

Dim WIP As New localhost.WIP

ds = WIP.GetTraveler ByStation(8)

Dim masterRow As DataRow

masterRow = ds.Tables(0).Ro ws(0)

'Add the first row cell

Dim masterNode As New TreeNode(master Row("Station_Na me").ToString() )

TreeView1.Nodes .Add(masterNode )-------------> This line is giving the
failure

masterNode.Imag eIndex = 6

masterNode.Sele ctedImageIndex = 6

'Go through the next rows and add the steps

For Each childRow As DataRow In ds.Tables(0).Ro ws

Dim childNode As New TreeNode("Step: " & childRow("Step" ).ToString())

masterNode.Node s.Add(childNode )

childNode.Image Index = 6

childNode.Selec tedImageIndex = 6

Next

'load the steps

LoadWIPParts(ds .Tables(0))

[Armin Zingler]

"john wright" <ri**********@h otmail.com> schrieb

I have my code done to populate a treeview, but when I move it to
the backgroundworke r I get an error "Action being performed on this
control is being called from the wrong thread. Marshal to the
correct thread using Control.Invoke or Control.BeginIn voke to
perform this action (code to follow). What am I doing wrong.

The message says what you're doing wrong and how to do it right.
See also:
http://msdn.microsoft.com/library/en...msControls.asp

http://msdn.microsoft.com/library/en...ms06112002.asp

http://msdn.microsoft.com/library/en...rmscontrol.asp

http://msdn.microsoft.com/library/de...et09272002.asp
Armin