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.
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Each control that accepts free-form user input has a Validating event that will occur whenever the control requires data validation.
In the Validating event-handling method, you can validate user input in several ways.
If you want to use implicit validation for a control, you must set that control's Auto Validate property to .
If you cancel the Validating event, the behavior of the control will be determined by what value that you assigned to Auto Validate.
The following code example uses the derived class Text Box and validates an email address that the user enters. Length) ' Set the Error Provider error with the text to display. Set Error(text Box1, error Msg) End If End Sub Private Sub text Box1_Validated(By Val sender As Object, _ By Val e As System. Validated ' If all conditions have been met, clear the error provider of errors. Set Error(text Box1, "") End Sub When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.
If the email address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled. Active Control property to the current form, focus events occur in the following order: Caution Do not attempt to set focus from within the Enter, Got Focus, Leave, Lost Focus, Validating, or Validated event handlers.You can validate the data as the data is entered in a control by reading the keys as they are pressed, or more commonly whenever the user takes the input focus away from one control and moves to the next.This approach is useful when you want to give the user immediate feedback about the data as they are working.Trying to match these restrictions is a complex task, often resulting in long regular expressions. NET Framework regular expression classes are part of the base class library and can be used with any language or tool that targets the common language runtime, including ASP. The following C# source code shows how to validate an email address with the help of regular expressions.When users enter data into your application, you may want to verify that the data is valid before your application uses it.Validation is very useful when you have bound your controls to a data source, such as a database table.