title: ExpectedException in nUnit gave me an error
body: <p>I'm new to using Testing Tools on the .NET Framework, so I downloaded it from NuGet with help from ReSharper.</p>
  
  <p>I am using this <a href="http://nunit.org/index.php?p=quickStart&amp;r=2.6">Quick Start</a> to learn how to use nUnit.  I had just copied the code and an error came up on this attribute:</p>
  
  <pre><code>[ExpectedException(typeof(InsufficientFundsException))] //it is user defined Exception 
  </code></pre>
  
  <p>The error is:</p>
  
  <blockquote>
    <p>The type or namespace name 'ExpectedException' could not be found
    (are you missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p>Why?  And if I need such functionality, what should I replace it with?</p>