Sealed modifier prevents other classes from inheriting from it.
Also you can use the sealed modifier on a method or property that overrides a virtual method or property in a base class. This enables you to allow classes to derive from your class and prevent them from overriding specific virtual methods or properties.
Examples
1. Sealed class
class C1 { }
sealed class C2 : C1 { }
class C3 : C2 { } // Error : cannot derive from sealed type C2
2. Sealed method
class A
{protected virtual void F() { }
protected virtual void F1() { }
}
class B : A
{
sealed protected override void F() { }
protected override void F1() { }
}
class C : B
{
protected override void F() { } //Error cannot override inherited member because it is sealeD
protected override void F1() { }
}
