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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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