protected void Page_Load(object sender, EventArgs e)
{
if (!this.Page.IsPostBack)
{
var context = new CountriesDataContext();
this.DropDownListCountries.DataSource = context.Countries;
this.DropDownListCountries.DataBind();
this.RebindTowns();
}
}
private void RebindTowns()
{
var countryId = int.Parse(this.DropDownListCountries.SelectedValue);
var context = new CountriesDataContext();
var towns =
from town in context.Towns
where town.CountryID == countryId
select town;
this.DropDownListTowns.DataSource = towns;
this.DropDownListTowns.DataBind();
}