public ActionResult ChangePassword(ChangePasswordModel model)
        {
            if (ModelState.IsValid)
            {
                string HashPassword = MPHash.GetPassWordMD5Hash(model.OldPassword);
                //hash password
                string HashNewPassword = MPHash.GetPassWordMD5Hash(model.NewPassword);


                if (MembershipService.ChangePassword(User.Identity.Name, HashPassword, HashNewPassword))
                {
                    TransactionLogViewModel.AddLog(User.Identity.Name + " has changed the password successfully!", DateTime.Now);

                    return RedirectToAction("ChangePasswordSuccess", "Account");
                }
                else
                {
                    TransactionLogViewModel.AddLog(User.Identity.Name + " change the password unsuccessfully", DateTime.Now);
                    ModelState.AddModelError("", LangText.GetText("THE_CURRENT_PASSWORD_IS_INCORRECT_OR_THE_NEW_PASSWORD_IS_INVALID"));
                }
            }

            // If we got this far, something failed, redisplay form
            ViewData["PasswordLength"] = MembershipService.MinPasswordLength;
            return View(model);
        }
        public ActionResult ChangePassword(ChangePasswordModel model)
        {
            if (ModelState.IsValid)
            {
                if (MembershipService.ChangePassword(User.Identity.Name, model.OldPassword, model.NewPassword))
                {
                    return RedirectToAction("ChangePasswordSuccess");
                }
                else
                {
                    ModelState.AddModelError("", "The current password is incorrect or the new password is invalid.");
                }
            }

            // If we got this far, something failed, redisplay form
            ViewData["PasswordLength"] = MembershipService.MinPasswordLength;
            return View(model);
        }