Where to enforce requirements

Requirement: the name variable in class X has a maximum length of 10 characters.

Should class X even know about this requirement, or should the requirement be enforced solely by the business logic class?

>>23
Okay, given no reason aside from baseless personal attack, I have no choice but to believe you. Thank you; you have shown me how I am wrong and how I can better myself - not only as a GUI programmer, but also as a human in general.