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Validating text input

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Input validation should be applied on both syntactical and semantic level.Syntactic validation should enforce correct syntax of structured fields (e.g.

The truth is that none of us filling in forms — there is a lot of evidence to show that users get annoyed by forms, and are one of main things that will cause them to leave and go somewhere else if they are done badly. We want to make filling out web forms as non-horrible as possible, so why do we insist on blocking our users at every turn?

SSN, date, currency symbol) while semantic validation should enforce correctness of their values in the specific business context (e.g.

start date is before end date, price is within expected range).

This is done using validation attributes on form elements, which allow you to specify rules for a form input like whether a value needs to be filled in, the minimum and maximum length of the data, whether it needs to be a number, an email address, etc., and a pattern that it must match.

The validate Form method assigns the elements you want to validate and then in this case calls the is Not Empty method to validate if the field is empty or has not been changed from the default value.