Can't use virtual and override on the same method in C#

Question

So apparently you cannot use the virtual modifier with the override modifier.

virtual - a method that can be overridden

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Answer 1

This behavior is right. If you don't want inherited class to override your virtual method, you can mark it "sealed" like this:

public class Line : DrawingObject
 {
       public sealed override void Draw()
       {
               Console.WriteLine("I'm a Line.");
       }
  }

After that LittleLine class won't be able to override Draw method.