MyWebService is undefined Error

[Hsuani]

function rowSelected(sender, args) {

      UserID = getDataItemKeyValue(sender, args.get_gridDataItem());

      currentRowIndex = args.get_gridDataItem().get_element().rowIndex;

     $find("<%= RadTabStrip1.ClientID %>").set_selectedIndex(0);

     MyWebService.GetUserByUserID(UserID, setValues)
}

I tried following link:
http://demos.telerik.com/aspnet-ajax/grid/examples/data-editing/insert-update-delete-client/defaultcs.aspx

and made a project
I change some method name and column name about database.

I made ServiceReference :

<telerik:RadScriptManager ID="ScriptManager1" runat="server">

      <Services>

          <asp:ServiceReference Path="MyWebService.asmx" />

      </Services>

</telerik:RadScriptManager>

but I will got error in JavaScript,MyWebService is undefined

I also tried
RadScriptManager.GetCurrent(this).Services.Add(new ServiceReference(ResolveUrl("MyWebService.asmx")));

but also the same.

Could somebody help me?
I use Windows 8.1,Visual Studio 2012 Professional,SQL Server 2014.
And browser is IE 11.



[Hsuani]

I found that I need to add namespace of web service.