Private Sub addParentNode_Button_Click(sender As Object, e As EventArgs)
treeView2.BeginUpdate()
Dim yourParentNode As String
yourParentNode = textBox1.Text.Trim()
treeView2.Nodes.Add(yourParentNode)
treeView2.EndUpdate()
End Sub
Private Sub addChildNode_Button_Click(sender As Object, e As EventArgs)
If treeView2.SelectedNode IsNot Nothing Then
Dim yourChildNode As String
yourChildNode = textBox1.Text.Trim()
treeView2.SelectedNode.Nodes.Add(yourChildNode)
treeView2.ExpandAll()
End If
End Sub
convert above code in c#.net