title: how to solve this :The URI prefix is not recognized
body: <p>When I am going to add some website like <code>http://www.nirmauni.ac.in/</code>, then it says the above mentioned error. So, how to fix this problem?
  I have given my code. Just go through and say where the change should be made.</p>
  
  <pre><code>bool IsLinkWorking(string url)
  {
      HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
  
      //You can set some parameters in the "request" object...
      request.AllowAutoRedirect = true;
      ServicePointManager.ServerCertificateValidationCallback = (s, cert, chain, ssl) =&gt; true;
  
      try
      {
          HttpWebResponse response = (HttpWebResponse)request.GetResponse();
  
          return true;
      }
      catch
      { 
          //TODO: Check for the right exception here
          return false;
      }
  }
  </code></pre>