ASP.NET C# masking without gif image progress (please wait or processing)

 <fieldset style="width:100%;">

   

            <legend >Student Details Report </legend>

            <div>

            <center>

             <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdpnlStudents" >

             <ProgressTemplate>

            <b style="color:Green"> Processing...</b>

             </ProgressTemplate>

             </asp:UpdateProgress>

             </center>

             </div>

            <asp:UpdatePanel ID="UpdpnlStudents" runat="server" UpdateMode="Conditional">

            <ContentTemplate>

</ContentTemplate>

<asp:PostBackTrigger ControlID="imgexcel" />

            <asp:PostBackTrigger ControlID="imgepdf" />

            </Triggers>

           

             </asp:UpdatePanel>

 </fieldset>  

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Also we can use AjaxControlToolkit :-

We can download from below link:-

https://www.nuget.org/packages/AjaxControlToolkit/

https://drive.google.com/file/d/1Dq-390V6NBVmTyavKmqY5DBhskgVwsdj/view?usp=sharing