C# checkListBox绑定

//创建链接;

SqlConnection con = DB.createConnection(); //不再用 new

con.Open();

SqlCommand cmd = new SqlCommand(sql,con);

SqlDataReader sdr = cmd.ExecuteReader();

this.CheckBoxList1.DataTextField = "";

this.CheckBoxList1.DataValueField = "";

this.CheckBoxList1.DataSource = sdr;

this.CheckBoxList1.DataBind();

sdr.Close(); //关闭记录集

con.Close(); //关闭链接