Repopulate TreeView

[JN]

Hi All,

When an update is made to the gridview, I need to get rid of the current
treeview and repopulate it with the changes.

How do I get rid of the current treeview?

Here is the code that populates the treeview when the page is first loaded.
Sub PopulateNodesSi mEx()
Dim dst As DataSet = GetTreeViewData ()

Dim masterNode As New TreeNode("SimEx Inc.")

TreeView1.Nodes .Add(masterNode )
For Each childRow As DataRow In dst.Tables("tbD epartmentsSimEx ").Rows

Dim childNode As New TreeNode(childR ow("SimExDepart ment").ToString ())

masterNode.Chil dNodes.Add(chil dNode)
For Each childRow1 As DataRow In childRow.GetChi ldRows("Childre nSimEx")

Dim childNode1 As New TreeNode(childR ow1("FullName") .ToString())

childNode.Child Nodes.Add(child Node1)

Next

Next
Thanks.
JN