Customize the built-in Outlook Select Names dialog (or any other)

using System.Data.Linq.Mapping;

namespace CustomAddressDialog.Database
{

    /// <summary>
    /// Represents a Customer Entity.
    /// </summary>
    [Table(Name = "Customers")]
    public class Customer
    {
        [Column(IsPrimaryKey = true, IsDbGenerated = true)]
        public int CustomerId { get; set; }

        [Column(CanBeNull = false)]
        public string Firstname { get; set; }

        [Column(CanBeNull = false)]
        public string Lastname { get; set; }

        [Column (CanBeNull = false)]
        public string Emailaddress { get; set; }

        public string Companyname { get; set; }

    }
}