asp.net - Programmatically change a TreeView expand depth

How to set, change TreeView expand depth (ExpandDepth) in page load
TreeViewExpandDepth.aspx

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">
    protected void Page_Load(object sender, System.EventArgs e)
    { 
        if(!this.IsPostBack)
        {
            TreeView1.ExpandDepth = 1;
        }
    }
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        TreeView1.ExpandAll();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to set, change TreeView expand depth (ExpandDepth) in page load</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">TreeView Example: ExpandDepth</h2>
        <asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" />
        <asp:TreeView 
             ID="TreeView1"
             runat="server"
             DataSourceID="SiteMapDataSource1"
             Width="250"
             BackColor="SkyBlue"
             ForeColor="White"
             >
        </asp:TreeView>
        <br />
        <asp:Button 
             ID="Button1" 
             runat="server"
             ForeColor="SteelBlue"
             Text="TreeView Expand All"
             Height="45"
             OnClick="Button1_Click"
             Font-Bold="true"
             />
    </div>
    </form>
</body>
</html>
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