title: UrlReferrer - need to find out where it's coming from
body: <p>I need to find out from which page the request is coming from. For instance I have a button in page A and when clicked it redirects as follows</p>
  
  <pre><code>http://...../ClientName/names.aspx?nameId=4,
  </code></pre>
  
  <p>Page A's </p>
  
  <pre><code>URL = "http://...../Maintenance/names.aspx?nameId=4"
  </code></pre>
  
  <p>In page B, I want to be able to determine if it's coming from Page A. Notice that Page A and Page B have the same ending but in different folders... How can I know in page B if it's coming from the names.aspx in folder Maintenance?</p>
  
  <p>Thank you</p>