When you use sealed modifiers in C# on a method, then the method loses its capabilities of overriding. The sealed method should be part of a derived class and the method must be an overridden method.
Let us see an example −
The following example won’t allow you to override the method display() because it has a sealed modifier for the ClassTwo derived class −
ClassOne is our base class, whereas ClassTwo and ClassThree are derived classes −
class ClassOne { public virtual void display() { Console.WriteLine("baseclass"); } } class ClassTwo : ClassOne { public sealed override void display() { Console.WriteLine("ClassTwoderivedClass"); } } class ClassThree : ClassTwo { public override void display() { Console.WriteLine("ClassThree: Another Derived Class"); } }
Above, under ClassThree derived class we have tried to override the sealed method. This will show an error since it is not allowed when you use the sealed method.