CSharp - Class and Method Sealing

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Introduction

An overridden function member may seal its implementation using sealed keyword to prevent it from being overridden.

The following code seals Square's implementation of Thickness, preventing a class that derives from Square from overriding Thickness. 

abstract class Shape{
       // Note empty implementation
       public abstract decimal NetValue { get; }
}
class Circle : Shape{
       public long Radius;
       public virtual decimal Thickness => 0;   // Expression-bodied property       
}
class Square : Shape{
       public decimal Width;
       public sealed override decimal Thickness { 
           get { return Width; } 
        }
}

You can seal the class itself which means seals all the virtual functions.

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