Form validation doubt

Hi I want to know how to make a field to be mandatory, i.e. can not be left blank, how to display a customize error message if the field is left blank, repopulate the fields already filled if the blank error occurs and finally if there is alrady a subroutine to verify if an email adress is valid or not.

Thanks
Vampmaster

Hi vampmaster,

Is this client-side validation - in the browser before the form is submitted? or

Is it serverside validation - security checks after the form is submitted.

If it is client-side there are validation settings in each element; if it is server-side you can add a Server Validation action to the form On Submit event.

Bob