private void buttonAddContract_Click(object sender, EventArgs e) { if (this.textBoxТNumberContract.Text == "" || this.comboBoxContragents.SelectedIndex == -1 || this.comboBoxOwners.SelectedIndex == -1) { return; } int idContr = (this.comboBoxContragents.SelectedItem as Contragents).ID; int idOwner = (this.comboBoxOwners.SelectedItem as owners).ID; bool b = service.AddContract(textBoxТNumberContract.Text, idContr, dtFromContr.Value.Date, dtDeadLine.Value.Date, idOwner, tbCommContract.Text); if (b == true) { MessageBox.Show("Договор добавлен"); this.textBoxТNumberContract.Text = ""; this.tbCommContract.Text = ""; this.comboBoxContragents.SelectedIndex = -1; this.comboBoxOwners.SelectedIndex = -1; } else { MessageBox.Show("Возможно такой номер дрговора уже существуетЭ.Попробуйте еще"); } }