title: Error when using .Contains to check if a string contains a character
body: <p>I am trying to find out if a string contains a character. I tried the following
  where ViewBag.Options is a string:</p>
  
  <pre><code>@ViewBag.Options.Contains('q')
  </code></pre>
  
  <p>but it gives me an error saying:</p>
  
  <p>The best overloaded method match for 'string.Contains(string)' has some invalid arguments. </p>