复制代码 代码如下:

public partial class _Default : System.Web.UI.Page
{
    protected string title=\"大家好\";            //前台代码<title><%#title %></title>
    protected void Page_Load(object sender, EventArgs e)
    {
        DataSet ds = new DataSet();
        string sql = ConfigurationManager.ConnectionStrings[\"strsql\"].ConnectionString;
        using (SqlConnection sqlCnn=new SqlConnection(sql))
        {
            using (SqlCommand sqlCmm=sqlCnn.CreateCommand())
            {
                sqlCmm.CommandText = \"select * from List\";
                SqlDataAdapter adapter = new SqlDataAdapter(sqlCmm);
                adapter.Fill(ds);
            }
            this.RadioButtonList1.DataSource = ds.Tables[0];
            this.RadioButtonList1.DataTextField = \"listname\";
            this.RadioButtonList1.DataValueField = \"id\";
            //this.RadioButtonList1.DataBind();
            this.CheckBoxList1.DataSource = ds.Tables[0];
            this.CheckBoxList1.DataTextField = \"listname\";
            this.CheckBoxList1.DataValueField = \"id\";
            //this.RadioButtonList1.DataBind();
            this.DataBind();
        }            //数据绑定到RadioButtonList,CheckBoxList
        if (!IsPostBack)
        {
            DataSet ds1 = new DataSet();
            using (SqlConnection sqlCnn1 = new SqlConnection(sql))
            {
                using (SqlCommand sqlCmm1 = sqlCnn1.CreateCommand())
                {
                    sqlCmm1.CommandText = \"select provinceid,provincename from Province\";
                    SqlDataAdapter adapter = new SqlDataAdapter(sqlCmm1);
                    adapter.Fill(ds1);
                    this.DropDownList1.DataSource = ds1.Tables[0];
                    this.DropDownList1.DataTextField = \"provincename\";
                    this.DropDownList1.DataValueField = \"provinceid\";
                    this.DropDownList1.DataBind();
                }
            }
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DataSet ds = new DataSet();
        string str = ConfigurationManager.ConnectionStrings[\"strsql\"].ConnectionString;
        using (SqlConnection sqlCnn = new SqlConnection(str))
        {
            using (SqlCommand sqlCmm = sqlCnn.CreateCommand())
            {
                sqlCmm.CommandText = \"select cityid,cityname from City where provinceid=\'\" + this.DropDownList1.SelectedValue + \"\'\";
                SqlDataAdapter adapter = new SqlDataAdapter(sqlCmm);
                adapter.Fill(ds);
                this.DropDownList2.DataSource = ds.Tables[0];
                this.DropDownList2.DataTextField = \"cityname\";
                this.DropDownList2.DataValueField = \"cityid\";
                this.DropDownList2.DataBind();
            }
        }
    }//实现省市二级联动
}