C#

sql_connection = new MySqlConnection(xmlClass.get_connectionstring("BizCards\\BizCards"));
sql_connection.Open();

sql_command = new MySqlCommand("sp_populate_countries", sql_connection);
sql_command.CommandType = CommandType.StoredProcedure;

// Create data adapter object 
sql_adapter = new MySqlDataAdapter();
sql_adapter.SelectCommand = sql_command;

// Create a dataset object and fill with data using data adapter's Fill method 
data_set = new DataSet();
sql_adapter.Fill(data_set, "countries");
DataViewManager dataview_manager = new DataViewManager(data_set);
DataView main_dataview = dataview_manager.CreateDataView(data_set.Tables["countries"]);

cboCountry.Properties.ValueMember = "country_code_alpha2";
cboCountry.Properties.DisplayMember = "country_name";
cboCountry.Properties.DataSource = main_dataview;

cboCountry.Properties.Columns.Add(new DevExpress.XtraEditors.Controls.LookUpColumnInfo("country_name", 50, "country_name"));

cboCountry.Properties.ShowHeader = false;

cboCountry.Properties.PopupSizeable = false;
cboCountry.Properties.ShowFooter = false;
cboCountry.Properties.PopupWidth = 50;

public class ORSerialLotNumber : string {}
public class SerialNumber : ORSerialLotNumber {}
public class LotNumber : ORSerialLotNumber {}

// ......

List<ORSerialLotNumber> mySLNList = new List<ORSerialLotNumber>();
SerialNumber sNum1 = "Sd-23s-3sf";
LotNumber nNum1 = "2342434";

mySLNList.Add(sNum1);
mySLNList.Add(nNum1);

// ......

foreach(var v in mySLNList)
    if(v.GetType() == typeof(SerialNumber))
        string serial = v;
    if(v.GetType() == typeof(LotNumber))
        string lot = v;