HttpContext.Current.User.Identity.Name is always string.Empty

by 
FormsAuthentication.SetAuthCookie(tbUsername.Text, true);
bool x = User.Identity.IsAuthenticated; //true
string y = User.Identity.Name; //""

The problem you have is at this point you’re only setting the authentication cookie, the IPrincipal that gets created inside the forms authentication module will not happen until there is a new request – so at that point the HttpContext.User is in a weird state. Once the redirect happens then, because it’s a new request from the browser the cookie will get read before your page is reached and the correct user object created.

Cookies are only set on the browser after a request is completed.

As an aside RedirectFromLoginPage creates a forms auth cookie anyway, you don’t need to do it manually

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