Cookie Expiration Update

See more:

ASP.NET

cookie

I have a cookie "IMF" which has the UserID set and the expiration is "End of browsing session".
I created a second cookie "LoginTime" and this cookie updates everytime the user changes pages.
I set the LoginTime cookie expiration after 2min and assigned it to a variable. I want to use this
variable to update the expiration of the IMF cookie.
When I check the browsing session cookies, IMF cookie is successfully updated with the
expiration after 2 mins, but "Response.Cookies("IMF").Expires = ExpireTime" the same statement is directly taking me to the "not logged in" page.
I was expecting to login first and then logout after 2 mins.
Where am I going wrong? Please help

Public Sub CheckLogin()

       If Not Request.Cookies("LoginTime") Is Nothing Then
           Response.Cookies.Set(New HttpCookie("LoginTime", Now()))
       End If

       Response.Cookies("LoginTime").Expires = DateTime.Now.AddMinutes(2)
       Dim ExpireTime As DateTime = DateTime.Now.AddMinutes(2)

       Response.Cookies("IMF").Expires = ExpireTime


       Dim strUser As String = ""

       If Not IsNothing(Context.Request.Cookies("IMF")) Then
           'IMF Cookie has a value. See if it's a ED cookie
           If Not IsNothing(Context.Request.Cookies("IMF")("EDUserID")) Then
               strEDUser = Request.Cookies("IMF")("EDUserID")


           End If
       End If

       'If this value is NULL, the the user is not a ED user. Send them to login page
       If strUser = "" Then

           Response.Redirect("not.logged.in.aspx")
       End If
   End Sub