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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(); 
}