How To Check User Logged In

To check whether the user has logged in or not a simple 2 lines to be checked in our application


using System.Security.Principal //namespace to be used

IPrincipal principal = HttpContext.Current.User; //gives the current user logged in
return principal.Identity.IsAuthenticated; //isauthenticated gives return true or false

so if user has logged in then it returns true and vice versa , the userid of the logged in user can be retrieved in the below manner


userId = new Guid(Membership.GetUser(Page.User.Identity.Name).ProviderUserKey.ToString());