Importance of validating an interactive user form

10 Dec

Here is one of form validation error messages that made me laugh aloud : “invalid last name. The form (or the souls that coded that form) decided my last name is bad and imagine, they want me to build a valid last name too!Bad, uninformed form validations can turn people away from your web form. Web forms are communication channels through which your users reach you.In the walkthrough, you will create a page for a Web site that allows visitors to request a reservation.Because the purpose of the walkthrough is to illustrate validation, the nature of the reservation is not important (for example, if could be for a restaurant, a community center meeting room, or something else), and the page does not actually process the reservation.It should be handled in the code without bothering the user.If you are afraid of SQL Injection, validating for single quotes and throwing a cryptic error message in the user’s face is not the solution.

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“Inline validation” helped me understand what was going on right away.

(The default for this page, if implemented, would be e-mail confirmation.) By default, the Web Forms page automatically validates that malicious users are not attempting to send script to your application even if you do not use validation controls. For information about the difference between these Web project types, see text box can be converted to a date value. The first is the custom validation code that runs when the page is submitted.

For more information, see In the first part of the walkthrough, you will create a Web site and a page where you can work with styles. You must always have server-side validation logic for a control as well.

The cancel button has a Causes Validation property. As we mentioned in the beginning of the article, validation can occur twice: once on the client’s machine and once on the server. Client side validation provides quick feedback for the user.

Validation occurs when a user clicks any Button control by default, but you can change this behavior by setting the Causes Validation property to false. Whenever the user presses a button on the form, the script executes the validation checks for each validation control on the form.