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public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection("server=.;uid=sa;pwd=4184085dsc;database=sheng;");
        con.Open();
        SqlCommand cmd=new SqlCommand("select * from one",con);
        SqlDataReader sdr = cmd.ExecuteReader();
        DropDownList1.DataSource = sdr;
        DropDownList1.DataTextField = "pro";
        DropDownList1.DataValueField = "id";
        DropDownList1.DataBind();
        sdr.Close();
     
        SqlCommand cmd1 = new SqlCommand("select * from two", con);
        SqlDataReader sdr1 = cmd1.ExecuteReader();
        DropDownList2.DataSource = sdr1;
        DropDownList2.DataTextField = "cityname";
        DropDownList2.DataValueField = "cityid";
        DropDownList2.


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