SvcUserController.cs

 [ForceHttps]
        [HttpPatch]
        public async Task<ActionResult> UpdatePassword(SvcUserPasswordUpdateViewModel viewModel)
        {
            viewModel.UserId = viewModel.UserId ?? ApplicationUserId;
            var user = await UserManager.FindByIdAsync(viewModel.UserId);
            var serviceResponse = new ServiceResponseObject();
            if (!ModelState.IsValid)
            {
                this.Response.StatusCode = 422;
                serviceResponse.ErrorMessage = "Please double check that passwords match.";
                return Json(serviceResponse);
            }

            if (user == null)
            {
                this.Response.StatusCode = 404;
                serviceResponse.ErrorMessage = "An error has occured";
                return Json(serviceResponse);
            }
            var result = await UserManager.ChangePasswordAsync(viewModel.UserId, viewModel.Password, viewModel.NewPassword);
            
            if (result.Succeeded)
            {
                serviceResponse.Data = _generateUserDetailsObject(user);
                string emailBody = String.Format("<p>Hi {0},<br>Based on your request, we have updated the password for your MyCulver's account.</p><p>To view or manage your profile, go to <a href=\"MyCulvers.com\">MyCulvers.com</a></p>", user.FirstName);
                string emailSubject = "Your MyCulver's password has been successfully updated";
                await EmailHelper.SendHtmlMailAsync("\"Culver's\" [email protected]", user.Email, "", "", emailSubject, emailBody);
            }
            else
            {
                this.Response.StatusCode = 422;
                serviceResponse.ErrorMessage = "An error has occured";
            }

            return Json(serviceResponse);
        }