title: Rewrite Contains() method C#
body: <p>I Have this clausule </p>
  
  <pre><code>if ((line.Contains('%')) || (line.Contains('@')) || (line.Contains("") &amp;&amp; (!line.Contains(','))))
  </code></pre>
  
  <p>and i want rewrite it to one method,beacause this is too slow. Any ideas??</p>