Right way to validate form fields !!

Hi,
I am having a form with many fields including TextFields, Dropdowns, DateFields, Checkboxes, Radiobuttons etc.
I am validating the most fields by making them REQUIRED. But I didn't found way to make Checkbox field required. So I am doing it by script by making its MANADATORY property to true. I am validating fields at the Form's preSubmit event.
All I want to know that whether it is the right way to validation i.e.
Making field.mandatory = true; (for checkboxes or may be some other field too)
Check it at preSubmit event of the form;
I want to code it according to best practices. That's why this question bounces up in the mind.
Thanks.
Abhinav

Thank you for your replies!
I understand how to get data into a JCombobox,
but what about my bigger, general question?
"I am confused because in other parts of my program I get a database connection and am not sure if you just form a query each time you need data or store the results somewhere (vector, array, collection)and use it this way." when the data or parts need to be used again.
This is the help I need.
Thanks again1
Alan

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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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env
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Right way to validate form fields !!

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