1using System;
2using System.Data;
3using System.Configuration;
4using System.Collections.Generic;
5using System.Web;
6using System.Web.Security;
7using System.Web.UI;
8using System.Web.UI.WebControls;
9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11
12using Microsoft.Win32;
13
14namespace DynamicWebSite.Framework
15{
16    public class CountryDropDownList : DropDownList
17    {
18        protected override void OnInit(EventArgs e)
19        {
20            base.OnInit(e);
21
22                        //would need some kind of state persistence / one time loading here like if(!Page.IsPostBack) or what have you

23                this.DataSource = GetCountries();
24                this.DataBind ();
25            
26        }
27
28
29        private List<string> GetCountries()
30        {
31            List<string> returnValues = new List<string>();
32
33            RegistryKey countries =
34             Registry.LocalMachine.OpenSubKey(
35              "Software\\Microsoft\\Windows\\CurrentVersion" +
36              "\\Telephony\\Country List");
37
38            if (countries != null)
39            {
40                // Get the list of subkeys,

41                // which is actually the country code

42                string[] subkeys = countries.GetSubKeyNames();
43
44                foreach (string ccode in subkeys)
45                {
46                    // Open the subkey, to get the country name

47                    RegistryKey country = countries.OpenSubKey(ccode);
48
49                    // ..get the country name from country key

50                    returnValues.Add(country.GetValue("Name").ToString());
51
52                    // We're done using the key, we should close it

53                    country.Close();
54                }
55
56                // It's now safe to close the country list key

57                countries.Close();               
58            }
59
60            returnValues.Sort();
61            return returnValues;
62        }
63    }
64}