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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.
Use this event to provide custom validation for any input control, such as a Text Box. In other words, the validating control will retain the focus until the user provides the correct format, even if the user clicks another control such as a button or textbox.
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 error provider simply takes a control and a message in the Set Error method and does the rest of the work for you!
Use this event to handle any needed upkeep after successfully validating the control.
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.