谁有二级下拉框联动的例子啊？谢拉，

Question

谢谢拉

Answer 1

private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack) 
{
//myconfig.messageokorno("你确定要刷新该值?",this.Button1);
// 在此处放置用户代码以初始化页面
string sqlstr = "";
sqlstr = "select * from u2";
DataSet ds = new DataSet();
//System.Data.SqlClient.SqlDataReader read = mydb.RunProcGetReader(sqlstr); //this.CheckBoxList1.DataSource = mydb.RunProc(sqlstr,ds);
//this.CheckBoxList1.DataValueField = "leixing";
//this.CheckBoxList1.DataTextField = "leixing";
//this.CheckBoxList1.DataBind(); this.DropDownList1.DataSource = mydb.RunProc(sqlstr,ds);
this.DropDownList1.DataValueField = "id";
this.DropDownList1.DataTextField = "sheng";
this.DropDownList1.DataBind();
this.DropDownList1.Items.Insert(0, new ListItem("请选择省份", "请选择省份"));
this.DropDownList2.Items.Insert(0, new ListItem("请选择城市", ""));
ds.Clone();
}
private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
{
if(this.DropDownList1.SelectedItem.Value == "请选择省份")
{
this.DropDownList2.Items.Clear();
this.DropDownList2.Items.Insert(this.DropDownList1.SelectedIndex,"请选择城市");
}
else
{
int x = Convert.ToInt32(this.DropDownList1.SelectedItem.Value.Trim());
string sqlstring1 = "select * from u3 where sheng = '"+ x +"'";
DataSet myds = new DataSet();

this.DropDownList2.DataSource = mydb.RunProc(sqlstring1,myds);
this.DropDownList2.DataValueField = "id";
this.DropDownList2.DataTextField = "chengshi";
this.DropDownList2.DataBind();

myds.Clone();
}

Answer 2

http://www.cnblogs.com/huazi4995/archive/2006/12/05/583111.htmlhttp://www.cnblogs.com/huazi4995/archive/2006/12/05/583101.html