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. }