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VB.Net How to completely clear a TreeView

I need to completely clear a TreeView control ready to accept new nodes. I have tried a couple of solutions from the net but still end up with the new nodes being appended to the bottom of the existing.

tvwPreAlert.Nodes.Clear() just does not do the job.
1 Solution
1. Have you programmatically looked at treeview.Nodes.Count to make sure there are now 0?

2. Did you call treeview.BeginUpdate() before calling treeview.Nodes.Clear()? If so, are you calling treeview.EndUpdate() afterwards?

3. How do you fill the treeview ? Is it through databinding ? If so, is your souce cleared ?
John (Yiannis) ToutountzoglouInstructor Multiengine PilotCommented:
try this ....
Private Sub TreeViewClear()
Dim x As Integer
With TreeView1.Nodes
For x = .Count To 1 Step -1
 .Remove x
Next x
End With
End Sub

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Hello TeDeSm

tvwPreAlert.Nodes.Clear() should work. How are you adding the items?

Also, are you re-adding the items after you clear them, perhaps in Page_Load outside of a if(!this.IsPostBack) check?


Richard Hughes

tvwPreAlert = New TreeView
TeDeSmAuthor Commented:
The treeview was being filled from a public arraylist. Clearing the array before re-filling handled the apparent append issue, BeginUpdate and EndUpdate dealt with the treeview nodes.
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