public void addButton_Click(object sender, EventArgs e) { var addReaderForm = new AddLibrarianForm(); DialogResult dialogResult = addReaderForm.ShowDialog(this); if (dialogResult == DialogResult.Cancel) { return; } string name = addReaderForm.nameTextBox.Text; string surname = addReaderForm.surnameTextBox.Text; string patronymic = addReaderForm.patronymicTextBox.Text; DateTime DoB = addReaderForm.dateTimePicker.Value; string telNumber = addReaderForm.telNumberTextBox.Text; var reader = new Librarian { Name = name, Surname = surname, Patronymic = patronymic, DateOfBirth = DoB, TelephoneNumber = telNumber }; var readerRepository = new LibrarianRepository(); readerRepository.Create(reader); _db.SaveChanges(); SetDataGridView(); }