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As I learn that interface is also used for encapsulate method but in the following code by casting ojb to MainClass I am able to access other method from Mainclass which I did not declare in interface so now where is encapsulation occur.
class Program
    static void Main(string[] args)
        IInterface obj = new MainClass();
        Console.WriteLine(((MainClass)obj).FullName()+" " +obj.LastName());

public interface IInterface
    string LastName();

public class MainClass:IInterface
    public  string FullName()
        return "Raman Singh";
    public string SayHello()
        return "Hello Sir111";

    public string LastName()
        return "Chauhan";
Updated 19-Jun-14 22:54pm
phil.o 20-Jun-14 4:57am
All of this has nothing to do with encapsulation. What makes you think it does?

1 solution

I just answered a very similar question to this - and that was yours as well.

Don't repost - it wastes time and annoys people.

But - there is a difference here, in that you are declaring your variable obj as a IInterface Type, which means it can contains an instance of any class with implements IInterface, and casting the variable to a specific derived class type - which means that (if the cast is successful) it will be a MainClass instance and you can then use all MainClass fields, properties, and methods.

If it isn't a MainClass instance, but a different class that implements IInstance then you will get a runtime error from the cast - but the system cannot definitely know that until your application runs.

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