準備工作：

1.下載引用(mysql-connector-net-5.2.7-noinstall)並新增引用，只需要新增其中一個“mysql.data.dll”就行了

2.新增引用

接下來，新增下列程式碼到一個新建類，MySQLCon

記得將資料庫名字，密碼修改下

 class MySQLConn
    {
        private string MysqlCon = "Database=document_manage; Data Source=localhost;User Id=root;"
            + "Password=123456;pooling = false; CharSet = utf8 ;port =3306";
        public DataTable ExecuteQuery(string sqlStr)
        {
            MySqlCommand cmd;
            MySqlConnection con;
            MySqlDataAdapter msda;//資料介面卡，DataAdapter物件在DataSet與資料之間起橋樑作用
            con = new MySqlConnection(MysqlCon);
            con.Open();
            cmd = new MySqlCommand(sqlStr, con);
            cmd.CommandType = CommandType.Text;
            DataTable dt = new DataTable();
            msda = new MySqlDataAdapter(cmd);
            msda.Fill(dt);
            con.Close();
            return dt;
        }

        public int ExecuteUpdate(string sqlStr)
        {
            int iud = 0;
            MySqlCommand cmd;
            MySqlConnection con;
            con = new MySqlConnection(MysqlCon);
            con.Open();
            cmd = new MySqlCommand(sqlStr, con);
            cmd.CommandType = CommandType.Text;
            iud = cmd.ExecuteNonQuery();
            con.Close();
            return iud;
        }

    }