AJAX UPDATE PROGRESS BAR

Though the question has been marked as answered, yet I would like to share few knowldegebase articles with you.

Have a look at these samples to understand the implementation and working of Update Progress:
MSDN: UpdateProgress Control Overview[^]
CP: The UpdateProgress Control of ASP.NET AJAX Extensions[^]
AJAX.NET UpdateProgress control[^]
ASPNET Tutorial: Introduction to AJAX UpdateProgress Control in ASP.NET and C#[^]

Use this :

<asp:updateprogress id="updprogress" runat="server">
        progresstemplate>
            <asp:image id="imgprogress" runat="server" imageurl="~/images/loading.gif" />
       progresstemplate>
   asp:updateprogress>

By adding the image named as Loading.gif inside the Images Folder.