protected void cityDropDownList_SelectedIndexChanged(object sender, EventArgs e)
 {
     using (FlexibleTennisLeagueDataContext dataContext = new FlexibleTennisLeagueDataContext())
     {
         if (!string.IsNullOrEmpty(cityDropDownList.SelectedItem.Value))
         {
             leagueDropDownList.Items.Clear();
             List <SelectDivisionByLeagueIdResult> results = dataContext.SelectDivisionByLeagueId(Convert.ToInt32(cityDropDownList.SelectedItem.Value)).ToList();
             foreach (SelectDivisionByLeagueIdResult result in results)
             {
                 leagueDropDownList.Items.Add(new ListItem(result.Division, result.DivisionId.ToString()));
             }
         }
     }
 }