Response.End() throws exception "Thread was being aborted"

Response.End() allways throws an Error this as per design.

Instead of Using Response.End() we have to Use

HttpContext.Current.ApplicationInstance.CompleteRequest();

Like this

 if (File.Exists(file))

    {

       HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);

       HttpContext.Current.Response.ContentType = type;

       Response.TransmitFile(file);                       

       HttpContext.Current.ApplicationInstance.CompleteRequest();

     }