title: convert system.guid to system.guid?
body: <p>I have this declaration in my code.</p>
  
  <pre><code>Guid? thisGuid = null;
  </code></pre>
  
  <p>I have also tried, </p>
  
  <pre><code>Guid? thisGuid = Guid.Empty;
  </code></pre>
  
  <p>There is section where Guid is referred:</p>
  
  <pre><code>Create(out thisGuid);
  </code></pre>
  
  <p>Also, other section:</p>
  
  <pre><code>this.abd.Fill(a,b, c, ref payGuid);
  </code></pre>
  
  <p>The conversion from Guid to Guid? is not taking place by either of above declarations. Also if i do not give Guid? than the Create() method throws an  error.</p>
  
  <p>HELP ME SOLVE THIS!</p>