try
                  {
               int val4 = Convert.ToInt32(tbGrupa.Text);
                string MyConString = "Data Source=**;User ID=******;Password=*****";
                OracleConnection conexiune = new OracleConnection(MyConString);
                OracleCommand comanda = new OracleCommand();
                comanda.Connection = conexiune;
                conexiune.Open();
                comanda.Transaction = conexiune.BeginTransaction();
                        int id_stud = Convert.ToInt16(tbCodStud.Text);
                        string nume = tbNume.Text;
                        string prenume = tbPrenume.Text;
                        string initiala_tatalui = tbInitiala.Text;
                        string email = tbEmail.Text;
                        string facultate = tbFac.Text;
                        int grupa = Convert.ToInt16(tbGrupa.Text);
                        string serie = tbSeria.Text;
                        string forma_de_inv = tbFormaInvatamant.Text;
                        DateTime data_acceptare_coordonare = dateTimePicker1.Value;
                        DateTime data_sustinere_licenta = dateTimePicker2.Value;
                        string sustinere = tbSustinereLicenta.Text;
                        string parola_acces = tbParola.Text;

                        try
                        {
                            comanda.Parameters.AddWithValue("id_stud", id_stud);
                            comanda.Parameters.AddWithValue("nume", nume);
                            comanda.Parameters.AddWithValue("prenume", prenume);
                            comanda.Parameters.AddWithValue("initiala_tatalui", initiala_tatalui);
                            comanda.Parameters.AddWithValue("facultate", facultate);
                            comanda.Parameters.AddWithValue("email", email);
                            comanda.Parameters.AddWithValue("seria", serie);
                            comanda.Parameters.AddWithValue("grupa", grupa);
                            comanda.Parameters.AddWithValue("forma_de_inv", forma_de_inv);
                            comanda.Parameters.AddWithValue("data_acceptare_coordonare", data_acceptare_coordonare);
                            comanda.Parameters.AddWithValue("data_sustinere_licenta", data_sustinere_licenta);
                            comanda.Parameters.AddWithValue("sustinere_licenta", sustinere);
                            comanda.Parameters.AddWithValue("parola_acces", parola_acces);

                            comanda.Transaction.Commit();
                            MessageBox.Show("Studentul " + tbNume.Text + " " + tbPrenume.Text + " a fost adaugat în baza de date!");                
                        }
                        catch (Exception er)
                        {
                            comanda.Transaction.Rollback();
                            MessageBox.Show("ER1.1:" + er.Message);
                            MessageBox.Show("ER1.2:" + er.StackTrace);
                        }
                        finally
                        {
                            conexiune.Close();
                        }         

            }
                    catch (Exception ex)
                    {
                        MessageBox.Show("ER2.1:"+ex.Message);
                        MessageBox.Show("ER2.2:"+ex.StackTrace);

                    }
       }