Get List of states of a selected country.

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I have two combo boxes one for country and the second is for states the second one should load based on the value selected in the country combobox. I am populating the country combobox in following way:

C#

private void PopulateCountryComboBox()
{
     RegionInfo country = new RegionInfo(new CultureInfo("en-US", false).LCID);
     List<string> countryNames = new List<string>();
     foreach (CultureInfo cul in CultureInfo.GetCultures(CultureTypes.SpecificCultures))
     {
          country = new RegionInfo(new CultureInfo(cul.Name, false).LCID);
          countryNames.Add(country.DisplayName.ToString() );
     }
     IEnumerable<string> nameAdded = countryNames.OrderBy(names => names).Distinct();
     foreach (string item in nameAdded)  {CountryComboBox.Items.Add(item);}
}

How can I bind the states list on the selected index change of country combobox?
Any positive responses will be appreciated.

Posted 16-Mar-15 0:31am

Sujith Karivelil

Updated 16-Mar-15 0:46am

Afzaal Ahmad Zeeshan

v2

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Comments

Andy Lanng 16-Mar-15 6:49am

Have you tried setting the country combo to postback on the SelectedIndexChange event?
This can be done via an ajax method on the client side also.

Sujith Karivelil 16-Mar-15 7:04am

everything works fine up to this. from where i choose the list of states for the selected country without using database? that's my problem. does RegionInfo is helpfull to get the list of states

Maciej Los 16-Mar-15 7:18am

If you mean you want to fetch State/Province/Region/Voivodeship, etc., No, it does not help you. You need to create database.

2 solutions

Solution 1

You can handle the SelectedIndexChanged[^] event and inside the handler, you can change the value of the second ComboBox, like this,

C#

void comboBox_SelectedIndexChanged(object sender, EventArgs e) {
   // Handle the event here...
   // Sender = your ComboBox; cast it to ComboBox
   // Get the SelectedIndex and see which country is selected
   // Find the states for that country... And populate the second control
}

This way, you can handle the change in first combo box, and depending on the value of SelectedIndex you can then search for the states for that country, and write them in the second combo box.

Posted 16-Mar-15 0:52am

Afzaal Ahmad Zeeshan

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Andy Lanng · Accepted Answer · 2015-03-16T05:57:00

I found this resource Geographing Database dump[^] through a giyf search. There is nothing built in to .Net that can provide this info. Culture info is not anywhere near exhaustive and definitely won't include such resolution as states and counties.

PS - I did see US and UK county dbs on that site - no idea if it works tho :S