A project with an Output type of Class Library cannot be started directly
<p>I've download sample code with C#. but when I run I get this error message:</p>

<blockquote>
  <p>A project with an Output type of Class Library cannot be started
  directly In order to debug this project, add an executable project to
  this solution which references the library project. Set the executable
  project as the startup project.</p>
</blockquote>

<p>Please give me a solution.</p>
