In global.asax: protected void Application_BeginRequest(Ob... sender, EventArgs e) { HttpRuntimeSection runTime = (HttpRuntimeSection)WebConf... //Approx 100 Kb(for page content) size has been deducted because the maxRequestLength proprty is the page size, not only the file upload size int maxRequestLength = (runTime.MaxRequestLength - 100) * 1024; //This code is used to check the request length of the page and if the request length is greater than...

<script type="text/javascript" language="javascript"> Sys.WebForms.PageRequestMan... function refresh() { //Your code here; } </script> Source