처음에 using 추가하기 ~ using System.Data.OracleClient; using System.Data.OracleClient; 그담엔 사용 선언 하기 namespace WindowsFormsApplication1 { public partial class MainFrm : Form { public OracleConnection Conn; public OracleTransaction Transaction; DataSet Ds = new DataSet();   public MainFrm() { InitializeComponent(); } } }namespace WindowsFormsApplication1 { public partial class MainFrm : Form { public OracleConnection Conn; public OracleTransaction … C# 오라클 접속하기 계속 읽기