title: MVC3 - How to output a file to download without saving it on the server first?
body: <p>In PHP, it is possible to return a file to the browser by echoing it out with the correct header. You do not need to save a copy of it prior on the server.</p>
  
  <p>So assuming I have a bunch of data I wish to return as a excel file - after creating the data structure using OpenXML, how can I serve the file to the user without saving it on the server first?</p>