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XML
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>

<script type="text/javascript">
function DoSomething()
{
    var v =event.target != null ? event.target : event.srcElement;
    if (v.tagName == "INPUT" && v.type == "checkbox")
    {
        alert(v.id);
        __doPostBack("","");
    }
}
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TreeView ID="TreeView1" onclick="DoSomething()" runat="server" ShowCheckBoxes="All"   OnTreeNodeCheckChanged="TreeView1_TreeNodeCheckChanged" >
            <Nodes>
                <asp:TreeNode Text="New Node" Value="New Node">
                    <asp:TreeNode Text="New Node" Value="New Node" ></asp:TreeNode>
                </asp:TreeNode>
                <asp:TreeNode Text="New Node" Value="New Node">
                    <asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
                </asp:TreeNode>
                <asp:TreeNode Text="New Node" Value="New Node">
                    <asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
                </asp:TreeNode>
            </Nodes>
        </asp:TreeView>
      </div>
    </form>
</body>
</html>


Code-Behind
C#
protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
    {
        if (e.Node.Checked)
        {
            Response.Write("1");
        }
    }
Posted

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If needed, pick one from here.[^]
 
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