Regular expression validator not validating
There are various validation controls availabe, and we will cover them in the rest of the article.
All of the validation controls derive from the Base Validator class, giving them common methods and properties.
Simply put, never trust the data in an incoming request, and always validate on the server.
To demonstrate the Range Validator, we will add an additional Text Box control to our web form (Hire Date Text Box), and a Range Validator.This is the exact position the error message will appear if validation fails. This also improves response time on the server because the ASP.For this first example we do not need to place much code into the code-behind file. NET runtime does not waste time processing a request with invalid information.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.