[C#] C#에서 엑세스(데이터베이스)를 사용하여 연동하기

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.OleDb; using System.Windows.Forms;   namespace DB_2 {     public class XDB     {         private OleDbConnection conn = null;         private OleDbCommand comm = null;         private OleDbDataReader read = null;           public XDB(string connectionString)         {             conn = new OleDbConnection();             comm = new OleDbCommand();             try             {                 conn.ConnectionString = connectionString;                 conn.Open();                 comm.Connection = conn;             }             catch (Exception e)             {                 conn = null;                 comm = null;                 MessageBox.Show(e.ToString());             }         }//XDB()         //----------------------------------------         //insert, delete, update같은 데이터를 읽지는 않고         //처리만 하는 함수         public bool NonQuery(string query)         {             if (conn == null || comm == null)             {                 MessageBox.Show("DB가 연결되어 있지 않습니다.");                 return false;             }               try             {                 comm.CommandText = query;                 comm.ExecuteNonQuery();             }             catch (Exception e)             {                 MessageBox.Show(e.ToString());                 return false;             }             return true;         }//NonQuery()         //---------------------------------------         public bool Query(string query)         {             if (conn == null || comm == null)             {                 MessageBox.Show("DB가 연결되어 있지 않습니다.");                 return false;             }               if (read != null) read.Close();               try             {                 comm.CommandText = query;                 read = comm.ExecuteReader();             }             catch (Exception e)             {                 MessageBox.Show(e.Message.ToString());                 return false;             }             return true;         }//Query()         //----------------------------------------------         public bool ReadNext()         {             if (read != null) return read.Read();             return false;         }         //--------------------------------------------         public string GetData(string name)         {             if (read != null) return read[name].ToString();             MessageBox.Show("읽은 데이터가 없습니다.");             return "";         }     }//class }//nameSpace