DebuggerDisplay.cs

using System.Diagnostics;

namespace DebuggerDisplay
{
    class Program
    {
        static void Main(string[] args)
        {
            var person = new Person("Derek", "Comartin", "derek@codeopinion.com", "codeopinion");
        }
    }

    [DebuggerDisplay("{Firstname} {Lastname}")]
    public class Person
    {
        public string Firstname { get; }
        public string Lastname { get; }
        public string Email { get; set; }
        public string Twitter { get; set; }

        public Person(string firstname, string lastname, string email, string twitter)
        {
            Firstname = firstname;
            Lastname = lastname;
            Email = email;
            Twitter = twitter;
        }
    }
}