public void adaugaInregistrareToolStripMenuItem_Click(object sender, EventArgs e, string nume)
        {
            Form_adauga_medic form_add_medic = new Form_adauga_medic(nume);

            form_add_medic.ShowDialog();

            if (form_add_medic.DialogResult == DialogResult.OK)
            {
                OleDbConnection conexiune = new OleDbConnection(Provider);
                OleDbCommand    comanda   = new OleDbCommand();
                comanda.Connection = conexiune;

                try
                {
                    conexiune.Open();
                    comanda.Transaction = conexiune.BeginTransaction();

                    comanda.CommandText = "SELECT max(id_medic) FROM medici;";
                    int cod = Convert.ToInt32(comanda.ExecuteScalar());

                    comanda.CommandText = "INSERT INTO medici(id_medic,nume,varsta,ore_lucrate_pe_saptamana,salariul,numar_pacienti,departament) " +
                                          " VALUES (@id_medic,@nume,@varsta,@ore_lucrate_pe_saptamana,@salariul,@numar_pacienti,@departament);";

                    comanda.Parameters.Add("id_medic", OleDbType.Integer).Value = cod + 1;
                    comanda.Parameters.Add("nume", OleDbType.Char).Value        = nume;
                    comanda.Parameters.Add("varsta", OleDbType.Integer).Value   = form_add_medic.medic.Varsta;
                    comanda.Parameters.Add("ore_lucrate_pe_saptamana", OleDbType.Double).Value = form_add_medic.medic.Ore_lucrate;
                    comanda.Parameters.Add("salariul", OleDbType.Double).Value        = form_add_medic.medic.Salariul;
                    comanda.Parameters.Add("numar_pacienti", OleDbType.Integer).Value = nr_pacienti;
                    comanda.Parameters.Add("departament", OleDbType.Char).Value       = form_add_medic.medic.Departament;

                    TreeNode newNode = new TreeNode(nume);
                    treeView1.Nodes.Add(newNode);

                    comanda.ExecuteNonQuery();
                    comanda.Transaction.Commit();
                }
                catch (OleDbException ex)
                {
                    MessageBox.Show(ex.Message);
                    comanda.Transaction.Rollback();
                }
                finally
                {
                    conexiune.Close();
                }

                UpdateList();
            }
        }
        private void modificaInregistrareToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Form_adauga_medic form_Adauga_Medic = new Form_adauga_medic((Medici)listView1.SelectedItems[0].Tag);

            form_Adauga_Medic.ShowDialog();

            if (form_Adauga_Medic.DialogResult == DialogResult.OK)
            {
                OleDbConnection conexiune = new OleDbConnection(Provider);
                OleDbCommand    comanda   = new OleDbCommand();
                comanda.Connection = conexiune;

                try
                {
                    conexiune.Open();
                    comanda.Transaction = conexiune.BeginTransaction();

                    //comanda.CommandText = "SELECT nume FROM medici WHERE id_medic = @id_m";
                    //comanda.Parameters.Add("id_medic", OleDbType.Integer).Value = Convert.ToInt32(((Medici)listView1.SelectedItems[0].Tag).Id_medic);
                    // string nume_for_update = comanda.ExecuteNonQuery().ToString();

                    comanda.CommandText = "UPDATE medici SET nume = @nume, varsta=@varsta, ore_lucrate_pe_saptamana = @ore_lucrate,salariul = @salariul,departament=@dep WHERE id_medic=@id_medic";

                    comanda.Parameters.Add("nume", OleDbType.Char).Value          = form_Adauga_Medic.medic.Nume;
                    comanda.Parameters.Add("varsta", OleDbType.Integer).Value     = form_Adauga_Medic.medic.Varsta;
                    comanda.Parameters.Add("ore_lucrate", OleDbType.Double).Value = form_Adauga_Medic.medic.Ore_lucrate;
                    comanda.Parameters.Add("salariul", OleDbType.Double).Value    = form_Adauga_Medic.medic.Salariul;
                    comanda.Parameters.Add("nume", OleDbType.Char).Value          = form_Adauga_Medic.medic.Nume;
                    comanda.Parameters.Add("id_medic", OleDbType.Integer).Value   = Convert.ToInt32(((Medici)listView1.SelectedItems[0].Tag).Id_medic);

                    int j = 0;
                    while (j < treeView1.Nodes.Count && treeView1.Nodes[j].Name != form_Adauga_Medic.medic.Nume)
                    {
                        j++;
                    }

                    TreeNode node = new TreeNode(form_Adauga_Medic.medic.Nume);

                    if (j == treeView1.Nodes.Count)
                    {
                    }
                    else
                    {
                        treeView1.Nodes[j] = node;
                    }

                    comanda.ExecuteScalar();
                    comanda.Transaction.Commit();
                }
                catch (OleDbException ex)
                {
                    MessageBox.Show(ex.Message);
                    comanda.Transaction.Rollback();
                }
                finally
                {
                    conexiune.Close();
                }

                UpdateList();
            }
        }