title: c# shortening string for url
body: <p>i want to uniquely shorten strings-file ids to use in urls like the ones on bit.ly etc. I can use ids from a db but i want urls to be random like.</p>
  
  <p>what would be the best solution?</p>
  
  <p>site will be a mobile site so i want to it to as short as possible</p>