ASP.NET FormsAuthentication

Anyone know how to use forms auth with C# to validate a user on a web app? I want to check to see if the user is logged in and if not, send them to the login page. The clincher is I am not using the persistant cookie with the forms auth method. How do I do it without the cookie?

I use a httpModule (and VB NET) and HttpCookie

but the syntax is (you nust adapt for C#)

Private Sub Authentification()

Dim __authTicket As FormsAuthenticationTicket
Dim __encryptedTicket As String
Dim __authCookie As HttpCookie

If anyBoolean Then
__authTicket = New FormsAuthenticationTicket(1, User.Text, DateTime.Now, DateTime.Now.AddMinutes(60), False, __anyRole)
Else
__authTicket = New FormsAuthenticationTicket(1, __anyUnKnownVariable, DateTime.Now, DateTime.Now.AddMinutes(15), False, zeroRole)
End If

__encryptedTicket = FormsAuthentication.Encrypt(__authTicket)
__authCookie = New HttpCookie(FormsAuthentication.FormsCookieName, __encryptedTicket)
HttpContext.Current.Response.Cookies.Add(__authCookie)

go to your page
End Sub