导入数据包：

using System.Data.OleDb;

打开连通数据库通道:

 OleDbConnection conn;
           private void Form1_Load(object sender, EventArgs e)
        { 
            //连通数据库库
            string address = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=nametb.accdb";
            conn = new OleDbConnection(@address);
            conn.Open();
            this.Text = "连接成功";
        }

连接数据库三步骤：

            //1.语句

            string sql = "delete from goodstb where gId=" + id;    //加上sql语句

            //2.操作对象

            OleDbCommand command = new OleDbCommand(sql, conn);

            //3.执行操作

            int count = command.ExecuteNonQuery();