Text box validating event simple dating script

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You will first see the programming you can use to handle errors, and then you will see how to use validation techniques to prevent bad data from being entered into your application in the first place.But in the real world, you need to handle unexpected problems when your code is running. Length Hi Dan, Ensure that the focus is set to some other control when moving off text box control. If the focus is not on some other control than text box but you try closing the form, this event will be fired twice, since the form performs the validation again. Length Hello to all I'm handling the Validating event for one text box. If something is wrong in user input I show a warning message. Cancel=true] to method the message is displayed twice (event fired twice). If something is wrong in user input I show a warning message. Cancel=true] to method the message is displayed twice (event fired twice). 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.

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Length Hello to all I'm handling the Validating event for one text box. If something is wrong in user input I show a warning message. Cancel=true] to method the message is displayed twice (event fired twice).

Then, we'll demonstrate how you can use validation techniques to prevent bad data from being entered into your application in the first place.

Consistent use of these techniques will help make your applications more robust and reliable.

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

Unlike Text Changed, Validated didn't fire for every character change; it only fired when the user was done.

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