title: Is there a way to check if a page has been landed on from an external source
body: <p>Using c#, I m looking to personalise a page if its the first page the user has come across.</p>
  
  <p>I'm not concerned whether the solution is bulletproof because the feature is purely asthetical and can degrade.</p>
  
  <p>It must use be an ASP.NET method, not JavaScript.</p>