title: Find character occurrences ignoring letter case c#
body: <p>I have a function, that returns a number of character occurrences at text. But there is a problem: letter case matters. 
  Function:</p>
  
  <pre><code>public static int GetOccurrences(String text, Char character)
      {
          return text.Count(x =&gt; x == character);
      }
  </code></pre>
  
  <p>For "<em>Lorem ipsum dolor sit amet, pro eu erant semper ancillae</em>" it will be 1 "L" and 3 "l", for example. Is it possible to ignore letter case?</p>