Final keyword in C#

Java has the final keyword, but C# does not have its implementation. For the same implementation, use the seal keyword.

Using seal, you can prevent methods from being overridden. When you use the sealed modifier on a method in C#, the method loses its override functionality. The Sealed method should be part of the derived class and the method must be an overridden method.

The following example does not allow you to override the method display() because it has the seal modifier of the ClassTwo derived class.

ClassOne is our base class, while ClassTwo and ClassThree are derived classes -

Example

class ClassOne {
   public virtual void display() {
         Console.WriteLine("Baseclass");
   }
}

class ClassTwo : ClassOne {
   public sealed override void display() {
      Console.WriteLine("ClassTwo:derivedClass");
   }
}

class ClassThree : ClassTwo {
   public override void display() {
      Console.WriteLine("ClassThree: Another Derived Class");
   }
}

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