How to add service reference dynamically from user control? Microsoft Ajax

First, Create a web page default.aspx and put the html code as following..

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<asp:ScriptManager ID="MainScriptManager" runat="server">
</asp:ScriptManager>
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Now, Create a usercontrol my first user control

Create a function called AddScriptReference as following...

'--------------------------------------------------------------------------
private void AddScriptReference()
{
     ScriptManager scriptManger = ScriptManager.GetCurrent(this.Page);
     if (scriptManger != null)
     {
         ServiceReference serviceReference = new ServiceReference();
         serviceReference.Path="~/MyWebService.asmx";
         serviceReference.InlineScript = false; 
         scriptManger.Services.Add(serviceReference);   
     }
     else
     {
         throw new Exception("Script Manager Not Found");
     }
}
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Then override controls init event as following...

'--------------------------------------------------------------------------
protected override void OnInit(EventArgs e)
{
     AddScriptReference();
     base.OnInit(e);
}
'--------------------------------------------------------------------------