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Important If you have custom validation that takes place after the Validating event, it will not affect the data binding.For example, if you have code in a Validated event that attempts to cancel the data binding, the data binding will still occur.Each control that accepts free-form user input has a Validating event that will occur whenever the control requires data validation.

The control also works well when bound to a data source.

The Format event on a data binding can be used to reformat incoming data to comply with the mask, and the Parse event can be used to reformat outgoing data to comply with the specifications of the data field. If you want full programmatic control over validation, or need to perform complex validation checks, you should use the validation events built into most Windows Forms controls.

When you use data binding, the data in your control is synchronized with the data source during execution of the Validating event.

If you cancel the Validating event, the data will not be synchronized with the data source.

An email address is a string of a subset of ASCII characters separated into two parts by an @ symbol . Is Match Method (String, String) - indicates whether the specified regular expression finds a match in the specified input string.

The part before the @ sign is the local part of the address, and the part after the @ sign is a domain name to which the email message will be sent . The pattern parameter consists of various regular expression language elements that symbolically describe the string to match pattern .If you do not set the Cancel property, Windows Forms will assume that validation succeeded for that control, and raise the Validated event.For a code example that validates an email address in a Text Box, see Validating.In this case, to perform validation in the Validated event, change the control's Data Source Update Mode property (under (Databindings)\(Advanced)) from On Validation to Never, and add So when does a control's data get validated? You can use either implicit or explicit validation, depending on the needs of your application.The implicit validation approach validates data as the user enters it.You may require that certain text fields not be zero-length, that a field be formatted as a telephone number or other type of well-formed data, or that a string not contain any unsafe characters that could be used to compromise the security of a database.

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