title: How to check if filename contains substring in C#
body: <p>I have a folder with files named </p>
  
  <ol>
  <li>myfileone</li>
  <li>myfiletwo </li>
  <li>myfilethree</li>
  </ol>
  
  <p>How can I check if  file "myfilethree" is present.</p>
  
  <p>I mean is there another method other than <code>IsFileExist()</code> method, i.e like filename contains substring "three"?</p>