我之前有連過資料庫都沒問題,怎麼換台電腦就不行
有大大可以幫我看一下,下面的code嗎?

//連接資料庫
            string myConnection_DB_String;
            MySqlConnection my_DB_Connection;
           myConnection_DB_String = String.Format("server =127.0.0.1; user id = ****; password = ****; database =ggo);");

            my_DB_Connection = new MySqlConnection(myConnection_DB_String);
            my_DB_Connection.Open();
            my_DB_Connection.Close();

string connString = "server=127.0.0.1;port=3306;user id=****;password=****;database=test;charset=utf8;";
            MySqlConnection conn = new MySqlConnection();
           conn.ConnectionString = connString;
            if (conn.State != ConnectionState.Open)
                conn.Open();

            string sql = @"select * from test";
           DataTable dt = new DataTable();
            MySqlDataAdapter adapter = new MySqlDataAdapter(sql, conn);
            adapter.Fill(dt);
             dt.Dispose();

            conn.Close();

不管用1.或2.都不行