Sealed class is used to define the inheritance level of a class.
The sealed modifier is used to prevent derivation from a class. An error occurs if a sealed class is specified as the base class of another class.
Some points to remember:
- A class, which restricts inheritance for security reason is declared, sealed class.
- Sealed class is the last class in the hierarchy.
- Sealed class can be a derived class but can't be a base class.
- A sealed class cannot also be an abstract class. Because abstract class has to provide functionality and here we are
restricting it to inherit.
Practical demonstration of sealed class
public sealed class BaseClass
public void Display()
Console.WriteLine("This is a sealed class which can;t be further inherited");
public class Derived : BaseClass
// this Derived class can;t inherit BaseClass because it is sealed
static void Main(string args)
BaseClass obj = new BaseClass();