using System;

public class Program

{

    public static void Main()

    {

        var app = new Application { Description = "abc" };

        var le = new LegalEntity { Name = "123" };

        var list = new ObjectVertex[] { app, le };

        foreach (var obj in list)

        {

            var abc = obj switch

            {

                    ObjectVertex a when a is Application app1 => app1.Description,

                    ObjectVertex a when a is LegalEntity le1 => le1.Name,

                    _ => "couldn't determine type"

            };

            Console.WriteLine(abc);

        }

        Console.WriteLine("Hello World");

    }

}

​

public class ObjectVertex {}

​

public class LegalEntity : ObjectVertex { public string Name { get; set; } }

​

public class Application : ObjectVertex { public string Description { get; set; } }