Database

OracleConnection dataConnection = new OracleConnection();
ArrayList objList = new ArrayList();
try
{
dataConnection.ConnectionString = "Data Source=orc;Persist Security  Info=True;User ID=scott;Password=tiger;Unicode=True";
dataConnection.Open();
 OracleCommand datacommand = new OracleCommand("SELECT * FROM DEPT", dataConnection);

OracleDataReader datareader = datacommand.ExecuteReader();
      Dept d = new Dept();
               while (datareader.Read())
               {

                   d.DNAME = datareader["DNAME"].ToString();
                   d.DEPTNO = datareader["DEPTNO"].ToString();
                   d.LOC = datareader["LOC"].ToString();
                   objList.Add(d);

               }

               datareader.Close();


           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }
           finally
           {
               dataConnection.Close();
           }

           try
           {
               cmbDname.DataSource = objList;
               cmbDname.DisplayMember = "DNAME";
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }

objList

objList.Add(d);

objList.Add(d.DNAME);