title: wait page while excel is generated in ASP.net
body: <p>I have a requirement, wherein i need to show a wait message while an excel report is being executed and when execution is complete, excel is written to response for user to save. Once save is done i need to hide the wait message.</p>
  
  <p>I was able to show wait message but i am not able to hide the same when the execution is complete. I have used Ifames to achieve the same.
  i do all the processing required for excel in the iframe and write to the response in the same Iframe. i attempted to hide the wait message using Javascript but any JavaScript function written in  onload,onunload, onbeforeunload etc of Iframe is not being executed.</p>
  
  <p>Is there any way i can call a JavaScript function , Or is there any other approach to the problem.</p>