Parse the required fields from the database

Есть такой код. В нём, по полученному мак адресу, надо спарсить с базы два значения UserName и Password. Помогите реализовать, а то тут ошибка вылазит. Скорее всего неправильный запрос я сделал

public static void Log_in()
{
string macAdress = GetMacAdress();
Console.Write("Input your username: ");
string Polusername = Console.ReadLine();

Console.Write("Input your password: ");
string Polpassword = Console.ReadLine();


string connString = ConfigurationManager.AppSettings.Get("Db");

MySqlConnection connection = new MySqlConnection(connString);
connection.Open();


string sravn = $"SELECT UserName FROM Название бд WHERE MacAdress LIKE {macAdress}";
string sravn2 = $"SELECT Password FROM Название бд WHERE MacAdress LIKE {macAdress}";

MySqlCommand command = new MySqlCommand(sravn, connection);
MySqlDataReader reader = command.ExecuteReader();

MySqlCommand command2 = new MySqlCommand(sravn2, connection);
MySqlDataReader reader2 = command.ExecuteReader();

string username = null;
string password = null;

while (reader.Read())
{
username = reader["UserName"].ToString();
}

while (reader2.Read())
{
password = reader2["Password"].ToString();
}

if (username == Polusername && password == Polpassword)
{
Console.WriteLine("entrance is allowed");
}
else
{
Console.WriteLine("no entry allowed");
Log_in();
}

}

C#

public static void Log_in()

        {

            string macAdress = GetMacAdress();

            Console.Write("Input your username: ");

            string Polusername = Console.ReadLine();



            Console.Write("Input your password: ");

            string Polpassword = Console.ReadLine();





            string connString = ConfigurationManager.AppSettings.Get("Db");



            MySqlConnection connection = new MySqlConnection(connString);

            connection.Open();



            

            string sravn = $"SELECT UserName FROM  Название бд WHERE MacAdress LIKE {macAdress}";

            string sravn2 = $"SELECT Password FROM Название бд WHERE MacAdress LIKE {macAdress}";



            MySqlCommand command = new MySqlCommand(sravn, connection);

            MySqlDataReader reader = command.ExecuteReader();



            MySqlCommand command2 = new MySqlCommand(sravn2, connection);

            MySqlDataReader reader2 = command.ExecuteReader();



            string username = null;

            string password = null;



            while (reader.Read())

            {

                username = reader["UserName"].ToString();

            }



            while (reader2.Read())

            {

                password = reader2["Password"].ToString();

            }



            if (username == Polusername && password == Polpassword)

            {

                Console.WriteLine("entrance is allowed");

            }

            else

            {

                Console.WriteLine("no entry allowed");

                Log_in();

            }



        }