Sessions

Hello experts

i have a login page whereby a session is created..if the admin logs in, it will be directted to addproduct.aspx and if a user login, it will direct to home.aspx...now to prevent users from seeing other pages without login i used the following code on all the pages


        If (Session("Admin") Is Nothing) Then
            Response.Redirect("login.aspx")
        End If


        If (Session("User") Is Nothing) Then
            Response.Redirect("login.aspx")
        End If


Therefore once log in, the user is directed to home.aspx or addproduct.aspx ...now here is my problem, once logged in, if ever login.aspx is typed in the address bar, it directs the user to the page, even though the latter is already logged in...any solution for this??/ it tried to use

        If not (Session("Admin") Is Nothing) Then
            Response.Redirect("addproduct.aspx")
        End If

        If not (Session("User") Is Nothing) Then
            Response.Redirect("home.aspx")
        End If

on the login.aspx form load but it doesnt work


any suggestion please