title: System.Web.Security doesn't exist in assemblies
body: <p>Either i am late to the party or i did something wrong. I am working with Visual Studio 2013 and i was trying to use Membership class however, <code>using System.Web.Security;</code> namespace doesn't exist in my assemblies.</p>
  
  <p>What can i do to solve this?</p>
  
  <p><strong>Note: <code>System.Web</code> exists</strong></p>
  
  <p><strong>Targeting: .NET Framework 4.5.1</strong></p>