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Using COM TreeView in C# Windows Forms TreeView was one of my favourite control in COM. It is well suited for creating Chart of Accounts, Hierarchical data and the like. Though there is a tree view in .Net I find it less flexible in comparison to COM TreeView. The issue with using COM TreeView in C# is C# does not support optional parameters. Type.Missing it the way out. using MSComctlLib; Node NodX; private void Form1_Load(object sender, EventArgs e) { Object m = Type.Missing; Object i = "India"; NodX = axTreeView1.Nodes.Add(ref m, ref m, ref i, ref i, ref m, ref m); Object k = "Kerala"; Object rel = TreeRelationshipConstants.tvwChild; NodX = axTreeView1.Nodes.Add(ref i, ref rel, ref k, ref k, ref m, ref m); Object ka = "Karnataka"; NodX = axTreeView1.Nodes.Add(ref i, ref rel, ref ka, ref ka, ref m, ref m); Object ko = "Kochi"; NodX = axTreeView1.Nodes.Add(ref k, ref rel, ref ko, ref ko, ref m, ref m); NodX.EnsureVisible(); } Contact : shalvin@gmail.com |