Hi Anil,
Here is a code which you requested. Hope this will help you.
Private Sub CreateTree()
Dim ParentNode As TreeNode = New TreeNode("Topic 1")
TreeView1.Nodes.Add(ParentNode)
Dim ChildNode As TreeNode = New TreeNode("Topic 1_Sub")
ParentNode.ChildNodes.Add(ChildNode)
Dim SubChildNode As TreeNode = New TreeNode("Topic 1_Sub_Sub")
ChildNode.ChildNodes.Add(SubChildNode)
End Sub
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