Validating html controles

The HTML5/Java Script Text Box (text field) is a control for editing, displaying, or entering plain text on forms to capture user names, phone numbers, email, and more.This control is an extended version of the HTML5 Text Box (input type text) control with icons, floating labels, different sizing, grouping, validation states, and more.

When validation fails the normal flow of execution continues.

You need to check the Is Valid property to know if a validation check failed.

This is when row validation takes place and the default Error Dialog with the specified error text is invoked.

Click Yes and then hover over error icons to see error messages specified for individual columns.

Notice in the following screen capture, we can see the Required Field Validator error message display on the form. The user does not wait on a server round trip to discover errors.

This is the exact position the error message will appear if validation fails. This also improves response time on the server because the ASP.

Malicious users might circumvent client side validations in an effort to break-in or damage your servers.

Simply put, never trust the data in an incoming request, and always validate on the server.

The complete listing for Web Form1cs is shown below. You can disable any of the validation controls by setting the Enabled property to false.

Html Controls; namespace Web Data Validation When the user clicks the Cancel button we clear the Text Box control and allow the user to start over.

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.

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