private void LOGIN_Click(object sender, EventArgs e) { mydb db = new mydb(); bool b; Utulisateur newusers = new Utulisateur(); droitacces droit = new droitacces(); db.Chargerlesinfos(newusers); string nom = username.Text.ToString(); string password = this.password.Text.ToString(); Utulisateur newuser = newusers.Session(newusers, nom, password); if (newuser == null) { b = false; } else { b = true; } if (b) { session session = new session(newuser, this); username.Text = ""; this.password.Text = ""; this.Visible = false; session.Visible = true; } else { MessageBox.Show("wrong passwordor username !"); } }