title: Asp.net page to return blank page with one word
body: <p>in order to corporate with external payment system, I need to respond with blank page with one word 'true' at the beginning. 
  I'm using Dotnetnuke 6 and c# .net 4.0 custom module. 
  I must work with data sent by them, and later put just at the beginning of page world 'true'. So I could somehow reset page and return null page with one word or insert it just at the beginning of the page (even before  tag ) 
  I cannot redirect to another page, it must be the same one. </p>
  
  <p>Any ideas ? Is it possible to obtain ?</p>