Change dropdownlist to combobox for windows forms.

I need the function on this page

in C# code for windows forms.  any ideas?
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I've created a form with nothing but a combobox.  See code below
using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using System.ComponentModel;
using Microsoft.Win32;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace Testing
    public partial class Form1 : Form
        public Form1()
        private List<string> GetCountries()
            List<string> returnValues = new List<string>();
            RegistryKey countries =
              "Software\\Microsoft\\Windows\\CurrentVersion" +
              "\\Telephony\\Country List");
            if (countries != null)
                // Get the list of subkeys,
                // which is actually the country code
                string[] subkeys = countries.GetSubKeyNames();
                foreach (string ccode in subkeys)
                    // Open the subkey, to get the country name
                    RegistryKey country = countries.OpenSubKey(ccode);
                    // ..get the country name from country key
                    // We're done using the key, we should close it
                // It's now safe to close the country list key
            return returnValues;
        private void Form1_Load(object sender, EventArgs e)
            List<string> countries = GetCountries();
            foreach (string country in countries)

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