Form validating event

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!

There is a Font Awesome issue (#41313) that causes the icon to be aligned not properly when using with Bootstrap.

You do not have to disable the Form’s Auto Validate property.

However, I prefer to call it explicitly and handle all validation at once since you most likely will take action only if the entire control’s children pass validation. The most important thing to recognize here is how precise you can be with the validation error message in the error provider.

The Name textbox works very similarly but we don’t have quite as elaborate validation logic.Let’s assume when we click our save button that we wish to validate the controls and display an icon if there is a problem.First, add the following code to the Form’s constructor after the Initialize Component method: This is a handy trick to prevent implicit validation of our controls when they lose focus. They will be disabled when the form input are invalid to prevent the valid form from multiple submissions.There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.

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The error provider simply takes a control and a message in the Set Error method and does the rest of the work for you!

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