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static void Main(string[] args)    {        Console.WriteLine(user("k", "1"));        Console.WriteLine(user("天下", "000"));        Console.ReadKey();    }    static bool user(string username, string password)    {        string connectstr = "server=127.0.0.1;port=3306;database=mygame;user=root;password=1234";        MySqlConnection connection = new MySqlConnection(connectstr);        connection.Open();        try        {            string str = "select *from users where username=@kk and password=@pp";            MySqlCommand command = new MySqlCommand(str, connection);            command.Parameters.AddWithValue("kk", username);            command.Parameters.AddWithValue("pp", password);            MySqlDataReader reader = command.ExecuteReader();            if (reader.Read())            {                return true;            }        }        catch (Exception e)        {            Console.WriteLine(e);        }        return false;    }

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