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In this chapter, we'll look at two facets of dealing with problems in . First, we'll demonstrate the programming that you can do to handle errors, allowing the user to make corrections when something goes wrong.Then, we'll demonstrate how you can use validation techniques to prevent bad data from being entered into your application in the first place.

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Therefore, data validation should start with business process definition and set of business rules within this process.But in the real world, you need to handle unexpected problems when your code is running.The user might delete a critical file or enter invalid data.These events can fire at the level of individual controls and also at the level of the form, thus allowing two levels of validation.An application also usually validates field-level data when the user finishes entry in each field and attempts to leave the field by setting focus away from it.

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