How to check user "logged in"?

Question

I am using authentication using the method below in an ASP.NET application

FormsAuthentication.RedirectFromLoginPage(txtUsername.Text, true); 

How to check if a user is logged in or not? And how can I get the registered user username?

Answer 1

I managed to find the right one. He is lower.

 bool val1 = System.Web.HttpContext.Current.User.Identity.IsAuthenticated 

EDIT

The credit for this edit refers to @Gianpiero Caretti , who suggested this in a comment.

 bool val1 = (System.Web.HttpContext.Current.User != null) && System.Web.HttpContext.Current.User.Identity.IsAuthenticated 

Answer 2

The easiest way to check if they have authenticated Request.User.IsAuthenticated I think (from memory)

Answer 3

The easiest way:

 if (Request.IsAuthenticated) ... 

Answer 4

 if (User.Identity.IsAuthenticated) { Page.Title = "Home page for " + User.Identity.Name; } else { Page.Title = "Home page for guest user."; }