Well........... at last the problem solved.
here is the code........
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Private Function GetCheckedChildNodes(ByVal nodes As TreeNodeCollection) As TreeNode()
Dim checkedNodes As New List(Of TreeNode)
For Each node As TreeNode In nodes
If node.Checked AndAlso node.Level > 0 Then
checkedNodes.Add(node)
End If
checkedNodes.AddRange(Me.GetCheckedChildNodes(node.Nodes))
Next
Return checkedNodes.ToArray()
End Function
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Private Sub Button1_Click() Handles Button1.Click
For Each node In Me.GetCheckedChildNodes(Me.TreeView1.Nodes)
Console.WriteLine(node.FullPath)
Next
End Sub
Thanks to all.
Popel
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