展开和折叠树视图

我正在使用treeview，在其中我只想扩展选中的node ，而其他的则是折叠.我使用了代码来执行此操作，但是我想知道如何在pageload 运行代码的地方.


我的代码如下:

I am using a treeview,in which i want to expand that node only which is selected,and others are collapse.I have used a code for doing this,but i want to know that how to bind the tree on pageload by which the code is run.


my code is given below:

protected void Tree_SelectNodeChange(object sender, EventArgs e)
{
   var tree = (TreeView)sender;
   foreach (TreeNode node in tree.Nodes)
   {
       node.CollapseAll();
   }
   ExpandToRoot(tree.SelectedNode);
}

private void ExpandToRoot(TreeNode node)
{
   node.Expand();
   if (node.Parent != null)
   {
       ExpandToRoot(node.Parent);
   }
}

感谢

thanks