using System;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        Shape s = new Shape();

        Shape c = new Circle();

​

        Stopwatch s1 = new Stopwatch();

        s1.Start();

        for(var i = 0; i<10000000; i++) {

            Display(s, i,i+4);

            Display(c, i,i+4);

        }

        s1.Stop();

        Console.WriteLine(s1.ElapsedMilliseconds);

        s1 = new Stopwatch();

        s1.Start();

        for(var i = 0; i<10000000; i++) {

            Do(s, i,i+4);

            Do(c, i,i+4);

        }

        s1.Stop();

        Console.WriteLine(s1.ElapsedMilliseconds);

    }

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public static int Display(IShape s, int a, int b) {

        return s.Do(a, b);

    }

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public static int Do(Shape s, int a, int b) {

        return s.Do(a, b);

    }

}

​

public class Shape: IShape {

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    int IShape.Do(int a, int b) {

        return a + b;

    }

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public virtual int Do(int a, int b) {

        return a + b;

    }

}

​

public class Circle: Shape, IShape {

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    int IShape.Do(int a, int b) {

        return a * b;

    }

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public override int Do(int a, int b) {

        return a * b;

    }

}

​

public interface IShape {

    int Do(int a, int b);

}