title: AspNetActiveDirectoryMembershipProvider & mixed logins
body: <p>I'm creating a WPF application, for which all users must be authenticated to an Active Directory.
  - Clientside, i'm using Client Application Services.
  - Server-side, i have an asp.net web application with a AspNetActiveDirectoryMembershipProvider.</p>
  
  <p>All is working as expected.</p>
  
  <p>There's one catch however.
  Some of the wpf application users log in with their windows in to the domain, others don't.</p>
  
  <p>So for the users which are logged in to the domain (group A), I do not want to ask for their username/password at application startup.
  The other users (group B) of course have to supply their Active Directory Username/password at application startup.
  This group B just perform Membership.ValidateUser(userName, password), ending up in the AspNetActiveDirectoryMembershipProvider and be authenticated.</p>
  
  <p>However, how can I check for group A that they have been succesfully authenticated to the AspNetActiveDirectoryMembershipProvider, without having
  to ask their username/password?</p>
  
  <p>Thanks,
  Koen</p>