title: Crystal Report Formula field
body: <p>I want to achieve the following in a Crystal report, please let me know if they are possible:</p>
  
  <ul>
  <li>Hide/Unhide a certain field based on an input parameter</li>
  <li>Change the content of a certain field in the page header and in the details sections based on an input parameter.</li>
  </ul>
  
  <p>I am using Visual Studio 2008 and C# 3.5 </p>
  
  <p>Thanks in advance</p>