title: How do I remove items from the query string for redirection?
body: <p>In my base page I need to remove an item from the query string and redirect. I can't use<br/></p>
  
  <pre><code>Request.QueryString.Remove("foo")
  </code></pre>
  
  <p>because the collection is read-only. Is there any way to get the query string (except for that one item) without iterating through the collection and re-building it?</p>