ASP.Net Tree View Sample

Following sample is self explanitory:
//-ASPX code<asp:TreeView ID="TreeView1" runat="server"  ShowLines="True">
</asp:TreeView>

//Code behind in C#
TreeNode parentNode = null;

parentNode = new TreeNode("Parent1","1");

TreeNode childNode = new TreeNode("Child1","10");

parentNode.ChildNodes.Add(childNode);

childNode = new TreeNode("Child2", "20");

parentNode.ChildNodes.Add(childNode);

parentNode.Collapse();

TreeView1.Nodes.Add(parentNode);

//////////////////////////////////

parentNode = new TreeNode("Parent2", "2");

childNode = new TreeNode("Child2", "20");

parentNode.ChildNodes.Add(childNode);

childNode = new TreeNode("Child3", "30");

parentNode.ChildNodes.Add(childNode);

parentNode.Collapse();

TreeView1.Nodes.Add(parentNode);

//////////////////////////////////