Sealed, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    //public sealed class ParentClass    // Error: cannot derive from sealed type 'Rextester.ParentClass'
    public class ParentClass
    {
        public virtual int Method1(int a)
        {
            Console.WriteLine(a);   
            return a;
        }
        public virtual string Method2(string Name)
        {
            Console.WriteLine("Parent Class Sealed Method : " + Name);   
            return Name;
        }
    }
    
    //public class ChildClass : ParentClass  --> We Can't inherit sealed class. we get above error.
    public class ChildClass : ParentClass
    {
           public int Method1(int a, int b)
           {
               Console.WriteLine(a*b);   
            return a*b;
           }
         //public override  string Method2(string Name)  //don't restrict
          public override sealed  string Method2(string Name)   
        {
            Console.WriteLine("Parent Class Sealed Method : " + Name);   
            return Name;
        }
    }
    
    public class Tclass: ChildClass
    {
           public override  string Method2(string Name)   
        {
            Console.WriteLine("Third Class Sealed Method : " + Name);   
            return Name;
        }
    }
    
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            ChildClass cc=new ChildClass();
            ParentClass pc=new ParentClass();
            Tclass tc=new Tclass();
            cc.Method1(2,5);
            cc.Method1(1000);  // Call Parent Class Method1 Method.
            pc.Method2("Chanti"); //Without Sealed Parent Class Method : Chanti
            cc.Method2("Chinna");  //Without Sealed Parent Class Method : Chanti
            tc.Method2("Chandu");  //With Sealed , cannot override inherited member 'Rextester.ChildClass.Method2(string)' because it is sealed
            tc.Method2("Chandu"); // Without Sealed Modifier, Third Class Sealed Method : Chandu
        }
    }
}

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