title: Get the user id of a username identity 2.0
body: <p>MVC 5 with asp.net identity 2.0</p>
  
  <p>I understand how to get the currently logged in user id.  I have a need to get the user id of a different user in the system.  How is this done?</p>
  
  <p>Ex.  I need to get the user id of user names "fsmith" ...</p>