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Validating user input in windows forms

I''m building a number of forms where user input must be validated, and then other controls are enabled, made visible, etc. before data is saved. Im trying to find detailed documentation of the order of events for text boxes, combo boxes, etc. Or examples of tried & true methods for validating in Windows Forms. I''m fairly new to VB.NET, but have much experience developing in Access. In Access I relied on my friends _before_update and _after_update to achieve what in .NET eludes me. This has become a humbling experience. My deadline approaches and I plead for advice!

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