Sealed method in C#

Question

I am a newbie in C#.I am reading about Sealed keyword.I have got about sealed class.I have read a line about Sealed method where we can make Sealed method also.The line was (By declaring method as sealed, we can avoid further overriding of this method.) I have created a demo but didn't understand that the meaning of above line and sealed method use. Below is my code:-

using System;

namespace ConsoleApplication2
{
    class Program:MyClass
    {
        public override sealed void Test()
        {
            Console.WriteLine("My class Program");
        }
        static void Main(string[] args)
        {
            Program obj = new Program();
            obj.Test();
            Console.ReadLine();
        }
    }

    class MyClass
    {
        public virtual void Test()
        {
            Console.WriteLine("My class Test");
        }
    }


}

Please tell me why we use Sealed methods and what are the advantages of Sealed methods.

Answer 1

Well, you are testing with only two levels of inheritance, and you are not getting to the point that you're "further overriding" a method. If you make it three, you can see what sealed does:

class Base {
   public virtual void Test() { ... }
}
class Subclass1 : Base {
   public sealed override void Test() { ... }
}
class Subclass2 : Subclass1 {
   public override void Test() { ... } // Does not compile!
   // If `Subclass1.Test` was not sealed, it would've compiled correctly.
}