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

using System.Linq;
using System.Data.Linq;
using System.Collections.Generic;
using System;
using System.IO;

namespace CustomAddressDialog.Database
{

    /// <summary>
    /// Represents the Databasecontext for our Contact Database
    /// </summary>
    public class CustomAddressDialogDB : DataContext
    {

        /// <summary>
        /// Construction code.
        /// Checks if the Database exists and if not, create a fresh DB from scratch.
        /// </summary>
        /// <param name="fileOrServerConnection">The full Path to the desired Database or a valid connectionstring.</param>
        public CustomAddressDialogDB(string fileOrServerConnection)
            : base(fileOrServerConnection)
        {
            if (!DatabaseExists())
            {
                CreateDatabase();
                AddCustomer("Ken", "Slovak", "some.address@somedomain.com", "Slovaktech");
                AddCustomer("Sue", "Mosher", "some.address@otherdomain.com", "Turtleflock");
                AddCustomer("Dmitry", "Streblechenko", "another.address@some.otherdomain.com", "Streblechenko");
                AddCustomer("Randy", "Byrne", "unknown@address.com", "Microsoft");
            }
        }

        /// <summary>
        /// Defines the Customer Table object
        /// </summary>
        public Table<Customer> _customerTable;

        /// <summary>
        /// Adds a new customer to the customers table
        /// </summary>
        /// <returns>Returns the new ID of the customer instance.</returns>
        public int AddCustomer(string firstname, string lastname, string emailaddress, string companyname)
        {
            Customer customer = new Customer();
            customer.Firstname = firstname;
            customer.Lastname = lastname;
            customer.Emailaddress = emailaddress;
            customer.Companyname = companyname;
            _customerTable.InsertOnSubmit (customer);
            SubmitChanges();
            return customer.CustomerId;
        }


        /// <summary>
        /// Search for all customers with the query in Lastname, Firstname or emailaddress
        /// </summary>
        /// <param name="query">The criteria</param>
        /// <param name="maxItems">Maximum Items to return</param>
        /// <returns>Returns a generic List of Customer objects.</returns>
        public List<Customer> FindCustomers(string query, int maxItems)
        {
            var q = from customer in _customerTable
                    where customer.Lastname.Contains(query)
                    || customer.Firstname.Contains(query)
                    || customer.Emailaddress.Contains(query)
                    orderby customer.Lastname, customer.Firstname
                    select customer;
            return q.Take(maxItems).ToList<Customer>();
        }

        /// <summary>
        /// Returns a collection of all Customers in the customers table
        /// </summary>
        /// <returns></returns>
        public List<Customer> GetCustomers()
        {
            var q = from customer in _customerTable
                    orderby customer.Lastname, customer.Firstname
                    select customer;
            return q.ToList<Customer>();
        }


    }
}