/// <summary>

        /// 重置密码

        /// </summary>

        /// <param name="username"></param>

        /// <param name="email"></param>

        /// <returns></returns>

        public ResetPasswordStatus ResetPassword(string username, string email)

        {

            MembershipUserCollection users = Membership.FindUsersByName(username);

            if (users.Count <= 0)//用户名未找到

            {

                //不要在BLL、DAL等非UI层来进行UI层的操作（比如MessageBox、Redirect）

                return ResetPasswordStatus.UserNameNotFound;

            }

            else if (users.Count > 1)

            {

                throw new Exception("存在多个重名的用户名："+username);

            }

            MembershipUser user = users[username];

            if (email != user.Email)//Email不匹配

            {

                return ResetPasswordStatus.EmailInvalid;

            }

            //重置密码

            string newPwd = user.ResetPassword();//重置为新密码

          

            //生成一个简单的随机的新密码

            //一种思路是用生成验证码的随机数算法

            //或者也可以使用取巧的办法，就是取Guid的后六位

            string guid = Guid.NewGuid().ToString();

            string newSimplePwd = guid.Substring(guid.Length - 6);

            user.ChangePassword(newPwd, newSimplePwd); //把ResetPassword返回的复杂的密码改成新密码

            CommonHelper.SendEmail(user.Email,

                "您在xx网的新密码", "。。新密码是：" + newSimplePwd);

            return ResetPasswordStatus.Success;

        }