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Possible Duplicate:
Why use getters and setters?
In C#(ASP.NET) we use getter and setter methods to set properties of private variables but same thing can be done if we declare that variable as public. Because at one end we are restricting user from accessing that variable by declaring it as private and on other end we are allowing user to access those properties by using getter and setter properties. I can’t understand its significance.
by using getter and setter you hide the internal implementation of your class. which means in the set method of a setter, you can run a whole algorithm to parse the input data into your internal data structure. you’ll be able to later change your implementation without any impact to your users.
now if you expose your internal members as public, you can’t hide them anymore, and any change you make to your class internal definition will probably break the user usage.