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hi i know for edit or add tags, you can validate the field as a date or as an email or as a credit card and so on
is it possible to add in more of such validation in the code and reuse the validation as part of asp.net maker

i thought it will be pretty to cool to add in our own validation for the individual fields besides using what is
already provided. example entry formats etc

You can add your own Custom validation functions. Read Field Setup -> Validation (for Add/Copy/Edit/Search) -> Validate (notes 3) in help file for more detail.

for some data, for example ,telephone number, is it possible asking user entering telephone number twice to check? I do not want to have two telephone number fields in database.

Add a custom field for the table then add your custom validation in Form_CustomValidate.