title: How to ignore the case sensitivity in List<string>
body: <p>Let us say I have this code</p>
  
  <pre><code>string seachKeyword = "";
  List&lt;string&gt; sl = new List&lt;string&gt;();
  sl.Add("store");
  sl.Add("State");
  sl.Add("STAMP");
  sl.Add("Crawl");
  sl.Add("Crow");
  List&lt;string&gt; searchResults = sl.FindAll(s =&gt; s.Contains(seachKeyword));
  </code></pre>
  
  <p>How can I ignore the letter case in Contains search?</p>
  
  <p>Thanks,</p>