Treeview document to save existing xml file...

[raj231362]

hi all, i am working in treeview control.i am reading a xml file and expanding , draging node to one place to another place.its working and showing in treeview control. but i want to update my existing file when i am draging node.. help me..!! here is my code:- private void treeView1_DragDrop(object sender, DragEventArgs e) { TreeNode newNode; if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false)) { Point pt; TreeNode destinationNode; pt = treeView1.PointToClient(new Point(e.X, e.Y)); destinationNode = treeView1.GetNodeAt(pt); newNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode"); if (!destinationNode.Equals(newNode)) { //destinationNode.Nodes.Add(newNode.Clone()); destinationNode.Nodes.Add((TreeNode)newNode.Clone()); destinationNode.Expand(); //Remove original node newNode.Remove(); } } }