public void supprimer(alerte_class alerte)
{
SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\bdd.mdf;Integrated Security=True");
String query = "Delete from Alertes WHERE Id_alerte='" + alerte.getidalerte() + "'AND id_utilis ='" + alerte.getidutilis() + "'";
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}