using System;

​

​

​

public class LabelAttribute : Attribute

{

    public LabelAttribute(string label)

    {

    }

}

​

​

​

public class Person

{

    [Label(string.Empty)]

    public string LastName { get; set; }

    public string FirstName { get; set; }

}   

​

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}