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

}