using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var a = new[]

        {

            new ShippingDriverDto { Name = "a" },

            new ShippingDriverDto { Name = "a" }

        };

        var b = new[]

        {

            new Test("a"), new Test("a")

        };

        Console.WriteLine(a.Distinct().Count());

        Console.WriteLine(b.Distinct().Count());

    }

}

​

public class ShippingDriverDto

{

    public string Name { get; set; }    

}

​

public record Test(string Name);