 public void Validate()
            {
                ValidationContext context = new ValidationContext(this, serviceProvider: null, items: null);
                List<ValidationResult> results = new List<ValidationResult>();
                bool isValid = Validator.TryValidateObject(this, context, results, true);

                if (isValid == false)
                {
                    StringBuilder sbrErrors = new StringBuilder();
                    foreach (var validationResult in results)
                    {
                        sbrErrors.AppendLine(validationResult.ErrorMessage);
                    }
                    throw new ValidationException(sbrErrors.ToString());
                }
            }