Mysql Baglanti hatasi ve kullanici girişi

MySqlConnection myBaglanti;
            string connString;
            MySqlConnectionStringBuilder builder = new MySqlConnectionStringBuilder();

            builder.UserID = "root";
            builder.Password = "";
            builder.Database = "test";
            builder.Server = "localhost";

            connString = builder.ToString();
            myBaglanti = new MySqlConnection(connString);
            myBaglanti.Open();

 try
            {
                MySqlCommand komut = new MySqlCommand("select * from uyeler where kullAdi = @txtKulladi and sifre = @txtSifre", myBaglanti);
                komut.Parameters.AddWithValue("@kullAdi", txtKulladi.Text);
                komut.Parameters.AddWithValue("@sifre", txtSifre.Text);
                komut.Connection.Open();
                MySqlDataReader rd = komut.ExecuteReader(CommandBehavior.CloseConnection);
                if (rd.HasRows)
                {
                    while (rd.Read())
                    {
                        if (rd["kullaniciGrubu"].ToString()=="0")
                        {
                            MessageBox.Show("admin");
                        }
                        else
                        {
                            //Boş
                        }
                    }
                }
                else
                {
                    rd.Close();
                    MessageBox.Show("Kullanici Bilgileri Yalnış");

                }
            }
            catch (Exception)
            {

                MessageBox.Show("baglanti hatası");
            }

 catch (Exception) 
            {

                MessageBox.Show("baglanti hatası");
            }