Redraw the treeview - Set the Selected.ChildNode as Parent

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C#

ASP.NET

treeview

I need to set the treeview1.selectednode.childnodes as parent each time the user makes a click on it, but on event click I am making a post back to open the right node so in the following code i need to make that in every postback redraws the treeview but dismiss the parent and set child as parent...

if (IsPostBack == true)
{
  TreeView1.RootNodeStyle.CssClass = "HideParent";
  TreeNode tn = TreeView1.FindNode(navigate);
  TreeView1.Nodes[0].ChildNodes.Remove(tn);
  TreeView1.DataBindings.Clear();
  //BindTreeView(0);
}