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This eliminates the possibility the end-users will incorrectly enter the values.The refining of the data is done later, when the data is passed to another layer for processing.

It maintains a mapping of error messages associated to each control in the form.In Windows Forms programming, validation is based around controls and events.Data-bound controls raise events when validation occurs, giving the opportunity to write validation logic.But the key components, which the end-users interact with, are those which reside in the presentation layer.Therefore, this is the first place where the validation should be done.

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