using System;

public class Program

{

    public static void Main()

    {

        Test(new Foo());

        Test(new Bar());

    }

    private static void Test(object x)

    {

        switch(x.GetType().ToString())

        {

            case nameof(Foo):

                Console.WriteLine("Inside Foo's code");

            break;

            case nameof(Bar):

                Console.WriteLine("Inside Bar's code");

            break;

        }

    }

}

​

public class Foo {}

public class Bar {}