title: Using Ookii.Dialogs.dll in c#
body: <p>Using <code>Ookii.Dialogs.dll</code> in windows form application (.net framework 3.5) gives error: </p>
  
  <blockquote>
    <p>Object reference not set to an instance of an object</p>
  </blockquote>
  
  <p>I have placed the <code>dll</code> file inside <code>bin&gt;&gt;Debug</code> and then added reference to this <code>dll</code>. On button click event, when I call the method of this <code>dll</code>, it gives above error. </p>
  
  <p>Any suggestion?</p>