asp.net 数据绑定的实例代码

　　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

　　}