title: Getting "Value cannot be null" with HTML Helper
body: <p>I am getting a "Value cannot be null" error from the code below:</p>
  
  <pre><code>@Html.Label(material.ExtendedGroup)
  </code></pre>
  
  <p><code>ExtendedGroup</code> is indeed <code>null</code>, but I would like to know how handle this with Razor's HTML helper -- something equivalent to <code>Isnull(material.ExtendedGroup,"",material.ExtendedGroup)</code> that we do in MS SQL. Please suggest a solution.</p>