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There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.The error provider simply takes a control and a message in the Set Error method and does the rest of the work for you!
But in the real world, you need to handle unexpected problems when your code is running.
The user might delete a critical file or enter invalid data.
Consistent use of these techniques will help make your applications more robust and reliable.
When an application encounters an unexpected situation (such as a missing file or input parameter) or a logical error (performing a division-by-zero operation, for example), by default the application will terminate and generate an error display like the one shown in Figure 3.1. NET displays an error message and terminates the application when any error occurs.
Select control you want to assign validation to and change its Validator1 property to choose desired validation type.