title: Start file download by client from Javascript call in C#/ASP.NET page?
body: <p>I need to initiate file download from ASP.NET page from javascript code.</p>
  
  <p>What would be my best option? Is it possible to call a webservice to do so, or somehow call usual event handler of C# page?</p>
  
  <p>Note that I will retrieve a large amount of data, many megabytes.</p>