public partial class _Default : System.Web.UI.Page
protected void Page_Load(object sender, EventArgs e)
if (IsPostBack == false)
//Let us populate the list of continents in the first drop down
drpContinent.DataSource = DBHelper.GetContinentList();
drpContinent.DataTextField = "continentName";
drpContinent.DataValueField = "continentName";
//Set the second dropdown as the list of all countries of selected continent
drpCountry.DataSource = DBHelper.GetCountriesList(drpContinent.SelectedValue);
drpCountry.DataTextField = "countryName";
drpCountry.DataValueField = "countryName";
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