新手请教如何将更新下拉选项的代码写成公共类？

SqlConnection con = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["AMDConnectionString"].ToString());

        con.Open();

        String SQL;

        SqlCommand cmd;

        SqlDataReader rd;

        //公司选项

        if (CompanyCode.Items.Count == 0)

        {

            CompanyCode.Items.Clear();

            SQL = "SELECT OrgCode + ' - ' + SaleOrg AS AA, OrgCode FROM SORG ORDER BY OrgCode";

            cmd = new SqlCommand(SQL, con);

            rd = cmd.ExecuteReader();

            while (rd.Read())

            {

                ListItem Item = new ListItem();

                Item.Text = rd["AA"].ToString();

                Item.Value = rd["OrgCode"].ToString();

                CompanyCode.Items.Add(Item);

            }

            rd.Close();

        }

       con.Close();