Question

I have the following code to download a file from the server to the client, that occurs when the button btnSavetoDB_ExportToExcel is clicked, after that I want to have the button disable, how can I achieve that?

string fileName = newFN + ".xlsx";
                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
                Response.TransmitFile(DestFile);                    
                Response.End();
btnSavetoDB_ExportToExcel.Enabled = false;

I noticed that the button did not become disable when placed the above code (Response), cause I had another code there and the button became disable with it. So it must be something related with the Response.

EDIT:

The button is within a ModalPopupExtender in case it matters.

Answer 1

I have found the solution to my problem, credit goes to: Dave Ward (click here)

<asp:Button ID="btnSavetoDB_ExportToExcel" runat="server" 
                    OnClientClick="this.disabled = true;"
                    UseSubmitBehavior="false"
                    Text="Save results to DB and export to Excel"   
                    onclick="btnSavetoDB_ExportToExcel_Click" />

this does the trick:
OnClientClick="this.disabled = true;"
UseSubmitBehavior="false"