Sealed Class In C#

In C#, the sealed modifier is used to define a class as sealed. In Visual Basic .NET, NotInheritable keyword serves the purpose of sealed. If a class is derived from a sealed class, compiler throws an error.

Ex:

     // Sealed class

     sealed class clsSealedClass

    {   

    }

·   But if you try to use this class as a base class you will get error.

    

     // Error will generate

     sealed class clsMyClass: clsSealedClass

    {   

    }

·   This example demonstrate how to use the sealed class

    using System;

    class clsMyClass

    {

        static void Main()

        {

            clsSealedClass oclsSealedClass = new clsSealedClass ();

            int total = oclsSealedClass.Add(4, 5);

            Console.WriteLine("Total = " + total.ToString());

       }

    }

    // Sealed class

    sealed class clsSealedClass

    {

        public int Add(int x, int y)

        {

             return x + y;

         }

     }

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