title: Track User ID in dimension in Google Analytics
body: <p>I have store UserName as UserId like:
  ga('create', 'UA-XXXXXXX', { @if (Request.IsAuthenticated){@Html.Raw("'userId': '" + User.Identity.Name + "'");} });</p>
  
  <p>in my asp.net mvc website: 
  <a href="http://www.persiangulfcup.org" rel="nofollow">www.persiangulfcup.org</a></p>
  
  <p>But I can't monitor specific username and track his/her actions.</p>