using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Taxi Tmp = test<Taxi>((Car)new Bus(){Width=10,Height=12});

        Console.WriteLine("Width=" + Tmp.Width.ToString() + " || " + "Height=" + Tmp.Height.ToString());

    }

    public static T test<T>(Car input) where T : Car ,new() {

        return new T(){Width=input.Width,Height=input.Height}; 

    }

}

​

public class Car {

    public int Width {

        get;set;

    }

    public int Height {

        get;set;

    }

}

​

public class Bus:Car {

   public string BusName {

        get;set;

   }

}

​

public class Taxi:Car{

  public string TaxiName{

       get;set;

  }

}