40.sealed method, it cannot be overridden.

 /*

 If you create a sealed class, it cannot be derived. If you create a sealed method, it cannot be overridden.

Local variables can't be sealed.

The sealed method in C# cannot be overridden further. It must be used with override keyword in method.

*/

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace sealed_method.cs

{

    class Base

    {

        public virtual string display()

        {

            return "Base class method";

        }

    }

    class Derived : Base

    {

        public sealed override string display()

        {

            return "sealed mehtod of Derived class";

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            Derived obj = new Derived();

            Console.WriteLine( obj.display());

            Console.Read();

        }

    }

}

OUTPUT:

sealed mehtod of Derived class