What is sealed class and sealed method?
Sealed Class 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: 1. A class, which restricts inheritance for security reason is declared, sealed class. 2. Sealed class is the last class in the hierarchy. 3. Sealed class can be a derived class but can't be a base class. 4. 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 using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace sealed_class { class Program { ...