title: Trouble checking if url param exists
body: <p>I'm having a bit of trouble trying to find if my url parameters exist or not. </p>
  
  <p>I have tried the following:</p>
  
  <pre><code> // doesn't work
  (Request.QueryString["showTop"] != "" &amp;&amp; Request.QueryString["showTop"] != null)
   // doesn't work
  (Request.Params["showTop"] != "" &amp;&amp; Request.Params["showTop"] != null)
  </code></pre>
  
  <p>I am trying to find the correct value. The full statement looks like:</p>
  
  <pre><code>showTop = (Request.QueryString["showTop"] != "" &amp;&amp;
             Request.QueryString["showTop"] != null) ? 
                       Request.QueryString["showTop"]  : (10).ToString();
  </code></pre>
  
  <p>Which works fine, <strong>if</strong> showTop exists with a value.</p>
  
  <p>This is being done within the view. </p>