The Validating event is intended to fire immediately after input has been completed but not accepted as valid.
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This prevents you to write a lot of validation code.
Every control exposes two events: Validating and Validated.
The example is based on a Windows Forms control developed by me which is based on the Text Box control and handles validation in a standardized way in order to detect input errors and display them to users.
Validation in Windows Forms Validations concerns about checking data entry and making sure it is valid based on the criteria of the application requirements.
Should this validation be done in the business layer or in the middleware component of a multi-layer application?