Check subnodes of treeview clicking parent node


I have a treeview control with showcheckboxes = All  in my C# web application.

When i check on the parent node all its child nodes should be checked automatically. similarlly when i uncheck a parent node all its childnodes should be unckecked.

How can i do this?

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bool blnValue=true; // or false
foreach (TreeNode tn in selectedNode.ChildNodes)
                    tn.Checked = blnValue;


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something like this will get you started

protected void TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
        SetSubNodesCheckState(e.Node, e.Node.Checked);

    public void SetSubNodesCheckState(TreeNode root, bool isChecked)
        if (root.ChildNodes.Count > 0)
            for (int idx = 0; idx < root.ChildNodes.Count; idx++)
                SetSubNodesCheckState(root.ChildNodes[idx], isChecked);
        root.Checked = isChecked;
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