Validating

In the Validating event-handling method, you can validate user input in several ways.

If you need to require users to enter data in a well-defined format, such as a telephone number or a part number, you can accomplish this quickly and with minimal code by using the Masked Text Box control.If you cancel the Validating event, the data will not be synchronized with the data source.Important If you have custom validation that takes place after the Validating event, it will not affect the data binding.A is a string made up of characters from a masking language that specifies which characters can be entered at any given position in the text box. If the user types an incorrect entry, for example, the user types a letter when a digit is required, the control will automatically reject the input.The masking language that is used by Masked Text Box is very flexible.You can find detailed instructions on how to do this in the refers to the document being validated when using document validation.However, when running update validators, the document being updated may not be in the server's memory, so by default the value of The other key difference that update validators only run on the paths specified in the update.If you determine that the control's data is not valid, you can cancel the Validating event by setting this object's Cancel property to .If you do not set the Cancel property, Windows Forms will assume that validation succeeded for that control, and raise the Validated event.If the built-in validators aren't enough, you can define custom validators to suit your needs.Custom validation is declared by passing a validation function.

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