The RegularExpressionValidator used in ch10 to validate the email address does not fire on a null entry. This causes the system to crash when it tries to add a null entry into the database. I have tried varying the RegExp but could not get it to fire on a null entry.

I added code to detect the null entry but this required a postback to work.

I think checking data entry like this should be done client-side.

Am I missing something.

Hi there,

In addition to the RegularExpressionValidator, also add a RequiredFieldValidator to the page.

This is how the validators work by design; the RequiredFieldValidator makes sure the field is filled in, while the other validators make sure the field is valid.

Cheers,

Imar