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C#

sealed


When applied to a class, the sealed modifier prevents other classes from inheriting from it. In the following example, class B inherits from class A, but no class can inherit from class B. You can also use the sealed modifier on a method or property that overrides a virtual method or property in a base class. This enables you to allow classes to derive from your class and prevent them from overriding specific virtual methods or properties.

Syntax:
class A {}    
    sealed class B : A {}


Example:

sealed class SealedClass
    {
        public int x;
        public int y;
    }

    class SealedTest2
    {
        static void Main()
        {
            SealedClass sc = new SealedClass();
            sc.x = 110;
            sc.y = 150;
            Console.WriteLine("x = {0}, y = {1}", sc.x, sc.y);
        }
    }
    // Output: x = 110, y = 150


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