How can i do form authentication and authorization in asp.net

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ASP.NET

I have create to folder one is Admin and one is User with separete web.config file.

and in global.asax file i have done this code....

protected void Application_AuthenticateRequest(object sender, EventArgs e)
    {
              if (HttpContext.Current.User != null)
        {
          cookie (ticket) exists for this user
            if (HttpContext.Current.User.Identity.IsAuthenticated)
            {
               FormsAuthentication
                if (HttpContext.Current.User.Identity is FormsIdentity)
                {
                  
                    FormsIdentity identity = (FormsIdentity)HttpContext.Current.User.Identity;
                    FormsAuthenticationTicket ticket = identity.Ticket;
                    string[] roles = ticket.UserData.Split(',');
                    HttpContext.Current.User = new System.Security.Principal.GenericPrincipal(identity, roles);
                }
            }
        }

but when i run the login page how can i check this page is for admin or user.

Plz tell me................