Hi,

In EPiServer 6 you could  hook to a DataFactory events or prepare a custom property. In EPiServer 7/8 you there is EPiServer.Validation.IValidate<T> interface.

Hi Grzegorz yes this I know, but how do after you done your comparison in Datafactory events send a response back to the user interface displaying for the user that the userinput is wrong.

"Your stopdate should be later than startdate".

/C

Did you check the CancelReason property? Maybe it could be used.

private void Instance_SavingContent(object sender, ContentEventArgs e)
{
e.CancelAction = true;
e.CancelReason = "Your stopdate should be later than startdate";
}

Nice I will look into this, I'll get back.

I would recommend to create a custom validator instead. It's easier and more convenient.

Here's an example for validating start and stop dates for a calendar event (CalendarEventPage), given that there is two properties called EventStartDate and EventStopDate in the content type.

public class CalendarEventPageValidator : IValidate<CalendarEventPage>
{
    public IEnumerable<ValidationError> Validate(CalendarEventPage instance)
    {
        if (instance.EventStartDate == null || instance.EventStopDate == null)
        {
            yield return new ValidationError
            {
                ErrorMessage = "An event start and stop date must be specified",
                PropertyName = "EventStartDate",
                RelatedProperties = new string[] { "EventStartDate", "EventStopDate" },
                Severity = ValidationErrorSeverity.Error,
                ValidationType = ValidationErrorType.StorageValidation
            };
        }
        else if (instance.EventStartDate > instance.EventStopDate)
        {
            yield return new ValidationError
            {
                ErrorMessage = "The event start date must occur before the stop date",
                PropertyName = "EventStartDate",
                RelatedProperties = new string[] { "EventStartDate", "EventStopDate" },
                Severity = ValidationErrorSeverity.Error,
                ValidationType = ValidationErrorType.StorageValidation
            };
        }

        yield break;
    }
}

Just add this class and compile. Done.