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public static void ValidateViewModel<TViewModel, TController>(this TController controller, TViewModel viewModelToValidate)
            where TController : Controller
        {
            var validationContext = new ValidationContext(viewModelToValidate, null, null);
            var validationResults = new List<ValidationResult>();
            Validator.TryValidateObject(viewModelToValidate, validationContext, validationResults, true);
            foreach (var validationResult in validationResults)
            {
                controller.ModelState.AddModelError(validationResult.MemberNames.FirstOrDefault() ?? string.Empty, validationResult.ErrorMessage);
            }
        }