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As it turns out, validating controls depends on what type of control and the format of the data you wish to validate.Typically you will be validating text that is provided by a Text Box, but it could also come from a Combo Box where the user can type their selection.The Name textbox works very similarly but we don’t have quite as elaborate validation logic.The validated event works the same, only pass it the name textbox instead.Here is just the validating event handler’s code: The event driven validation model in Win Forms is powerful and flexible enough to allow you to create high quality apps that implement robust and maintainable validation code in your forms.Now practice your newly learned skills on your own and experiment with the error provider control!Each control has the following events and properties that are used to validate a form. Validation on a control is triggered when the control loses focus. Cancel Event Args] object as a parameter to the event block, which you can access this by using the in the Validating event, all events that would usually occur after the Validating event are suppressed.
Important: Never attempt to set the Focus of a control in this event because it can cause the script to hang.After the validating event returns without being cancelled, meaning we have valid user input, then the validated event will be raised.In this case, we simply clear any error messages in the error provider.A typical case where Causes Validation property is set to False is when there is a cancel button.There is no need to validate a control that loses focus when the user wishes to cancel out of the form; therefore, the button’s Causes Validation property can be set to false.