string user_name = model.username.ToString();
                string userRoles = model.Ltype.ToString();
                FormsAuthenticationTicket Ticket = new FormsAuthenticationTicket(1, user_name, DateTime.Now, DateTime.Now.AddMinutes(30), false, userRoles, "/");
                string HashTicket = FormsAuthentication.Encrypt(Ticket);
                HttpCookie UserCookie = new HttpCookie(FormsAuthentication.FormsCookieName, HashTicket);
                HttpContext.Current.Response.Cookies.Add(UserCookie);以上是写入Cookie方法马上结贴.谢谢..