Treeview.nodes.clear is throwing exception

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C#

C#4.0

Hi,

I am trying to clear the treeview but it is throwing an exception "ObjectReference not set" when i checked the Treeview.node.count it is 1

so iam thinking how come this error occur.

private void LoadLayout(Layout result) {
   TreeView view = dtLayout;
      view.SuspendLayout();
     view.Nodes.Clear();---------------------------->here the exception occur
    TreeNode root = new TreeNode("root",result.Label,result.ImageKey) { Tag = result };
     view.Nodes.Add(root);
     AddTreeNodes(result.Children,root);
     root.Expand();
     view.SelectedNode = SelectNode(view.Nodes[0]);
     view.ResumeLayout();
   }