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I am building an MVC 3 application with an IIS 7.5 backend. On my controller, I have action methods that allow the user to add/edit domain objects. The Action handles HTTP Post, has a return value of string which contains any validation error messages encountered during the save process. Here is an example of one Action Method: [HttpPost] public string CustomerEdit(CustomerModel customerModel) { var errorMessages = new StringBuilder(); var serverErrors = new List<string>(); //Map to a customer domain object Mapper.CreateMap<CustomerModel, Customer>(); var customer = Mapper.Map<CustomerModel, Customer>(customerModel); if (customerModel.Oper == "del") { var customerIds = new List<Guid>(); customerIds.Add(customer.Id); if (!_serverService.DeleteCustomers(customerIds)) { errorMessages.Append("The item could not be deleted"); Response.StatusCode = Constants.STATUS_SERVER_ERROR; } } else { //Validate if (!_serverService.ValidateCustomer(customer, out serverErrors)) { foreach (var error in serverErrors) { ModelState.AddModelError("Validation", error); } } //Save if (ModelState.IsValid) { var saveStatus = _serverService.SaveCustomer(ref customer, _id); if (!saveStatus) { errorMessages.Append("The server encountered and error during Save"); Response.StatusCode = Constants.STATUS_SERVER_ERROR; } } else { errorMessages.Append(GetValidationErrors(ModelState)); Response.StatusCode = Constants.STATUS_SERVER_ERROR; }

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