IO should be handled by a dedicated class (like your Program class or something better) - the principle that you're violating here is called Separation of Concerns: en.wikipedia.org/wiki/Separation_of_concerns. The setter should only know the various restrictions that it has and throw an exception in the case that an invalid value makes it that far. Try something like this: The solution for handling this according to your rules are almost obvious but the thing is, it's better not to put the checking and validating logic in the setter method of a property, you can have a separate class for instance and that class does the validation responsibility for you and you can tell it to do that and then use the result appropriately.
In that case you are following "Tell, Don't Ask" rule and also "Single Responsibility Principle" Good Luck I would create a method for changing the name that contains the validation logic.
Anthony Moore Microsoft Corporation July 2000 Updated March 2002 Summary: Provides a brief overview of the validation framework in ASP.
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In computer science, data validation is the process of ensuring that a program operates on clean, correct and useful data.
It uses routines, often called "validation rules" "validation constraints" or "check routines", that check for correctness, meaningfulness, and security of data that are input to the system.
One of the features of HTML5 is the ability to validate most user data without relying on scripts.
This is done using validation attributes on form elements, which allow you to specify rules for a form input like whether a value needs to be filled in, the minimum and maximum length of the data, whether it needs to be a number, an email address, etc., and a pattern that it must match.
In evaluating the basics of data validation, generalizations can be made regarding the different types of validation, according to the scope, complexity, and purpose of the various validation operations to be carried out.