给你参考一下：
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection con = new SqlConnection("server=;database=province;uid=sa;pwd=sa;");
con.Open();
SqlCommand cmd = new SqlCommand("select * from province", con);
SqlDataReader sdr = cmd.ExecuteReader();
DropDownList1.DataSource = sdr;
DropDownList1.DataTextField = "proname";
DropDownList1.DataValueField = "proid";
DropDownList1.DataBind();
con.Close();
sdr.Close();
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("server=;database=province;uid=sa;pwd=sa;");
con.Open();
SqlCommand cmd2 = new SqlCommand("select * from city where pro>
前台:
<td class="td_page">新闻类型:</td>
<td><asp:DropDownList ID="dropNewType" runat="server"></asp:DropDownList></td>
后台:
DataTable dt = CDB.FillTable("select TypeId, TypeContent from [newsTypeTable]");
dropNewType.DataSource = dt;
dropNewType.DataTextField = "typeContent";
dropNewType.DataValueField = "TypeId";
dropNewType.DataBind();