C # Accesshelper

Using system;using system.collections.generic;using system.linq;using system.text;using System.Data.OleDb;using        System.data;public class Accesshelper:idisposable {private OleDbConnection m_conn = new OleDbConnection ();        public static string DATABASE = AppDomain.CurrentDomain.BaseDirectory + "rate.accdb";            Public Accesshelper () {string connstr = "Provider = microsoft.ace.oledb.12.0;";            ConnStr + = "Data Source =\" "+ DATABASE +" \ ""; M_conn.            ConnectionString = ConnStr; M_conn.        Open ();            public void ExecuteCommand (String sql) {OleDbCommand cmd = null; Lock (Cmd=new OleDbCommand ()) {cmd.                Connection = M_conn;                Cmd.commandtext = SQL; Cmd.            ExecuteNonQuery ();             }} public void ExecuteCommand (String sql, oledbparameter[] PS) {OleDbCommand cmd = null; Lock (cmd = new Oledbcommand ()) {cmd.                Connection = M_conn;                Cmd.commandtext = SQL; foreach (OleDbParameter p in PS) {cmd.                Parameters.Add (P); } cmd.            ExecuteNonQuery ();            }} public Object Querysome (String sql) {OleDbCommand cmd = null; Lock (cmd = new OleDbCommand ()) {cmd.                Connection = M_conn;                Cmd.commandtext = SQL; using (OleDbDataReader or = cmd. ExecuteReader ()) {if (or. Read ()) {return or.                    GetValue (0);        }}} return null;            } Public DataTable GetSource (string strsql) {DataTable dt = null;            OleDbCommand cmd = null;            OleDbDataAdapter ad = null; try {lock (dt = new DatatabLe ()) {cmd = new OleDbCommand (strSQL, m_conn);                    AD = new OleDbDataAdapter ((OleDbCommand) cmd); Dt.                    Clear (); Ad.                Fill (DT);            }} catch (Exception e) {throw e;        } return DT; } void IDisposable.Dispose () {m_conn.            Close (); M_conn.            Dispose ();        M_conn = null; }    }

C # Accesshelper