using (OleDbConnection conn = new OleDbConnection(settings.ConnectionString))

using (OleDbConnection conn = new OleDbConnection(settings.ConnectionString))

的有关信息介绍如下：

看看能有点用吗using System;using System.Collections.Generic;using System.Text;using System.Data.OleDb;using System.Data;namespace DAL{ public class DBHelper { private string connectionString= @"Provider = Microsoft.Jet.OLEDB.4.0;Data Source = " + Application.StartupPath + @"\Data\NMS.mdb"; ///

/// 执行增删改操作 返回int 类型 ///

/// /// /// public static int GetScalar(string sql) { int result = 0; using (OleDbConnection conn = new OleDbConnection(connectionString)) { conn.Open(); OleDbCommand cmd = new OleDbCommand(sql, conn); result = cmd.ExecuteNonQuery(); conn.Dispose(); conn.Close(); } return result; }