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In Win Forms I could handle the Validated event to do something after the user changed text in a Text Box.

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.

Unhandled errors in an application can result in unexpected termination, lost data, and potentially even create security holes if input values are not properly restricted.

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