C# Winform中的ComboBox控件绑定数据库项目作为列表内容

 //初始化院区下拉列表,使用了Oracle数据库中的表项目
            try
            {
                //string connString = "User=system;Password=manager;Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.80.13)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = oracleService)))";
                string connString = "User=system;Password=123456;Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = oracleService)))";
                OracleConnection conn = new OracleConnection(connString);
                try
                {
                    conn.Open();
                    OracleCommand cmd = new OracleCommand("select t.hosp_zonename from org_hospitalzone_dict t", conn);
                    OracleDataReader odr = cmd.ExecuteReader();
                    while (odr.Read())
                    {
                        this.comboBox_HospitalZone.Items.Add(odr[].ToString());
                    }
                    odr.Close();
                    conn.Close();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message.ToString());
                }
                finally
                {
                    conn.Close();
                }
                //this.tabControl.SelectedIndex = 2;//设置默认选项，idnex号码是从0开始的
            }
            catch (Exception exp)
            {
                MessageBox.Show(exp.Message);
            }