private void listaImprumut_KeyDown(object sender, KeyEventArgs e)
        {
            var     imprumutMod = (Imprumut)listaImprumut.SelectedItems[0].Tag;
            Carte   c           = imprumutMod.carte;
            Cititor ci          = imprumutMod.cititor;

            if (e.KeyCode == Keys.Enter)
            {
                using (var formularModificaContract = new FormContract(imprumutMod))
                {
                    if (formularModificaContract.ShowDialog(this) == DialogResult.OK)
                    {
                        using (var form = new FormCarte(c))
                        {
                            if (form.ShowDialog() == DialogResult.OK)
                            {
                                using (var formc = new formCititor(ci))
                                {
                                    formc.ShowDialog();
                                }
                            }
                        }
                    }
                }
            }
        }
        private void adaugareToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listaImprumut.BringToFront();
            listaImprumut.Enabled = true;
            if (listaImprumut.Visible == false)
            {
                listaImprumut.Visible = true;
            }
            if (listaCarti.Visible == true)
            {
                listaCarti.Visible = true;
            }
            using (var formular = new FormContract(null))
            {
                if (formular.ShowDialog() == DialogResult.OK)
                {
                    using (var formCarte = new FormCarte())
                    {
                        if (formCarte.ShowDialog() == DialogResult.OK)
                        {
                            using (var formCititor = new formCititor())

                            {
                                if (formCititor.ShowDialog() == DialogResult.OK)
                                {
                                    var nouImprumut = new Imprumut(int.Parse(formular.tbNumarContract.Text)
                                                                   , new DateTime(int.Parse(formular.tbAn.Text), int.Parse(formular.tbLuna.Text), int.Parse(formular.tbZi.Text)),
                                                                   new Carte(formCarte.tbTitlu.Text,
                                                                             formCarte.tbAutor.Text,
                                                                             formCarte.tbDomeniu.Text,
                                                                             int.Parse(formCarte.tbCota.Text),
                                                                             int.Parse(formCarte.tbRaft.Text)),
                                                                   new Cititor(formCititor.tbNume.Text, formCititor.tbAdresa.Text, formCititor.tbCnp.Text, int.Parse(formCititor.tbVarsta.Text)));
                                    imprumuturi.Add(nouImprumut);
                                    if (nouImprumut.data_imprumut.Year == 2015)
                                    {
                                        an2015++;
                                    }
                                    if (nouImprumut.data_imprumut.Year == 2016)
                                    {
                                        an2016++;
                                    }
                                    if (nouImprumut.data_imprumut.Year == 2017)
                                    {
                                        an2017++;
                                    }
                                    if (nouImprumut.data_imprumut.Year == 2018)
                                    {
                                        an2018++;
                                    }
                                    if (nouImprumut.data_imprumut.Year == 2019)
                                    {
                                        an2019++;
                                    }
                                    ;
                                    incarcareVector(vector);
                                    afisareImprumuturi();
                                }
                            }
                        }
                    }
                }
            }
        }