asp.net 数据绑定的实例代码


            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}