这是 城市和省份用ajax做的二级联动


请问在后台还可以获取这个城市的选中的值,可以获取到省份选中的值,但是城市该怎么获取

------解决思路----------------------
获取二级联动二级值示例
//DropDownList下拉框AJAX设置显示二级菜单
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddlProvince" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="ddlProvince_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddlCity" runat="server">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
//绑定数据库数据显示二级菜单
SqlConnection sqlcon;
string strCon = ConfigurationManager.AppSettings["conn"];
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
sqlcon = new SqlConnection(strCon);
string sqlst = "select Province from tb_Province";
sqlcon.Open();
SqlDataAdapter myda = new SqlDataAdapter(sqlst, sqlcon);
DataSet myds = new DataSet();
myda.Fill(myds);
ddlProvince.DataSource = myds;
ddlProvince.DataValueField = "Province";
ddlProvince.DataBind();
string strCity = "select * from tb_City where Province='" + ddlProvince.SelectedItem.Text + "'";
SqlDataAdapter mydaCity = new SqlDataAdapter(strCity, sqlcon);
DataSet mydsCity = new DataSet();
mydaCity.Fill(mydsCity);
ddlCity.DataSource = mydsCity;
ddlCity.DataValueField = "City";
ddlCity.DataBind();
sqlcon.Close();
}
//点击一级菜单显示对应的二级菜单
protected void ddlProvince_SelectedIndexChanged(object sender, EventArgs e)
{
sqlcon = new SqlConnection(strCon);
string sqlst = "select * from tb_City where Province='" + ddlProvince.SelectedItem.Text + "'";
SqlDataAdapter myda = new SqlDataAdapter(sqlst, sqlcon);
DataSet myds = new DataSet();
sqlcon.Open();
myda.Fill(myds);
ddlCity.DataSource = myds;
ddlCity.DataValueField = "City";
ddlCity.DataBind();
sqlcon.Close();
}//codego.net/tags/11/1/
//获取菜单内容变成字符串操作
string Province = this.ddlProvince.Text;
string City = this.ddlCity.Text;
------解决思路----------------------
服务器只认识服务器控件,然后是怎么认识的呢?是通过viewstate,你那种做法就是直接输出html,对于服务器来说,那就是一段要展示给用户看的字符串,根本不是服务器知道的服务器控件