asp.net form 验证 和取值

  FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
                          1,                          
                          "ticketName",
                          DateTime.Now,
                          DateTime.Now.AddMinutes(60),
                          false,
                          "{UserNAme:'sanmao'}"
                          );
                string token = FormsAuthentication.Encrypt(ticket);
                HttpCookie userCookie = new HttpCookie(FormsAuthentication.FormsCookieName, token);
                Response.Cookies.Add(userCookie);
                string url = FormsAuthentication.GetRedirectUrl(UserName, false);//获取来源地址
                Response.Redirect(url);

 System.Web.HttpContext context = System.Web.HttpContext.Current;

            // 取得用户对象
            System.Security.Principal.IPrincipal user = context.User;

            // 取得用户的角色数组
            System.Web.Security.FormsIdentity fi = user.Identity as System.Web.Security.FormsIdentity;

            // 取得用户的票据
            System.Web.Security.FormsAuthenticationTicket ticket = fi.Ticket;

            // 创建用户所拥有的角色数组
            string roleString = ticket.UserData;

            // 还原为字符串数组
            string[] roleArray = { roleString };//roleString.Split(',');

            // 自己创建用户对象
            System.Security.Principal.GenericPrincipal principal
                = new System.Security.Principal.GenericPrincipal(
                    user.Identity,
                    roleArray
                    );
            // 让系统使用我们的拥有角色的用户对象
            context.User = principal;

            Response.Write(tt);