protected void treenodes()
{
 TreeNode tree = new Treenode();
 tree.text = "My TreeNode";
 Tree.value = 1;
 tree.SelctAction = SelectAction = TreeNodeSelectAction.Expand;
 //aqui são os childNodes
 Treenode subTree = new TreeNode();
 subtree.text = "My TreeNode";
 subTree.value = 1.1;
 tree.ChildNodes.Add(subTree);
 TreeView.Nodes.Add(tree);
}