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namespace lecteur_mp3
{
    public partial class LecteurMP3 : Form
    {
        string  music, music2;
 
        public LecteurMP3()
        {
            InitializeComponent();
        }
 
        string Conx = "Server=localhost;Database=blindtest;User id=etude;password=;";
        NpgsqlConnection Cnx = null;
 
        private void buttonChoix_Click(object sender, EventArgs e)
        {         
                Cnx = new NpgsqlConnection(Conx);
                Cnx.Open();
                using (var Cmd = new NpgsqlCommand())
                {
                    Cmd.Connection = Cnx;                               
                    Cmd.CommandText = "SELECT nom from morceau order by random()";
                    NpgsqlDataReader readernom = Cmd.ExecuteReader();
                    while (readernom.Read())
                      {
                             music = readernom.GetString(0);
                             music2 = readernom.GetString(1);
                      }                 
                }
                button1.Text = music;
                button2.Text = music2;
        } | 
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