using System.Diagnostics;
public static void Main()
for (int i = 0; i < 10; i++)
Stopwatch sw = new Stopwatch();
for (int i = 0; i < N; i++)
Console.WriteLine("Direct call: {0:F2}", sw.Elapsed.TotalMilliseconds);
for (int i = 0; i < N; i++)
Console.WriteLine("Through interface: {0:F2}", sw.Elapsed.TotalMilliseconds);
public virtual void Bar()