Cargar un control TreeView en asp.net

//Nodo Principal
TreeNode oNode = new TreeNode();
oNode.Text = "Nodo Principal";oNode.Value = 1;
oNode.NavigateUrl = "Default.aspx";
oNode.Target = "";
treeSections.Nodes.Add(oNode);

//Nodo hijo
TreeNode oChildNode = new TreeNode();
oChildNode.Text = "Inicio";
oChildNode.Value = "2";
oChildNode.Target = "";
oChildNode.NavigateUrl = "Inicio.aspx";
oNode.ChildNodes.Add(oChildNode);