Sealed Class in C#

Classes declared with the sealed keyword cannot be extended. That means, when you declare a base class with this keyword, you cannot use it in a derived class. In other words the class cannot be extended. This keyword is similar to that of final keyword in Java.
The given example SealedClass.cs is a modified version of the example of Inheritance.cs. Here we are giving the example of sealed class. It declares the base class xyz as sealed..
// SealedClass.cs
using System;
// error location
sealed class xyz
// Erase the Protected modifier and observe the result. 
public void Sum()
int num1 = 10;
int num2 = 20;
int num3 = num1+num2;
class derivedclassSealed: xyz
public static void Main()
derivedclassSealed hd = new derivedclassSealed ();
When you execute the above code, you will get a compilation error indicating that the derived class cannot inherit from the sealed base class Computer.
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