public static void Main()
public virtual void DoStuff()
Console.WriteLine("HI, i'm a.");
public override void DoStuff()
Console.WriteLine("HI, i'm a,b.");
public override void DoStuff()
Console.WriteLine("HI, i'm a,b,c.");
public sealed override void DoStuff()
Console.WriteLine("HI, i'm a,d.");
public new void DoStuff()
Console.WriteLine("HI, i'm a,d,e.");