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When validation fails the normal flow of execution continues.
You need to check the Is Valid property to know if a validation check failed.
They can be useful during information validation, to ensure that data is in a specified format.
For example, a ZIP code must consist of five digits, and the last name must start with a capital letter.
Before we look at the code sample, I would like to provide a little explanation of Regular Expressions.
Regular Expressions are specially formatted strings for specifying patterns in text.
This Required Field Validator forces the user to enter text into the control associated with the validator. If you want to make sure the user changes a default value placed into the control, set the control’s Text value and the Initial Value property of the Required Field Validator to the same value.
The associated control is set by right clicking on the validator and selecting Properties from the context menu. The rest of the validation controls provided by ASP.
Simply put, never trust the data in an incoming request, and always validate on the server.In the Properties dialog box find the Control To Validate property and select First Name Text Box from the drop down list. We can set other properties, such as the Error Message property, and the final ASPX source code should look like the following. NET work in a similar fashion to what we've seen above. If the client's web browser is of executing client side Java Script, the first validation pass occurs on the client.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.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.We can double click on both of the Button controls on the form to add event handlers for the click events. If you want to disable just client side validation for a specific validation control, you can set the control’s Enable Client Script property to false. NET will always execute validation checks on the server when a button click event arrives requiring validation.