private void SaveButton_Click(object sender, EventArgs e)
{
if (StudentComboBox.Text != "" && BookComboBox.Text != "")
{
_borrows.ReturnBorrow(_students.ReadStudent(StudentComboBox.Text).StudentId,
_books.ReadBook(BookComboBox.Text).BookId, ReturnDatePicker.Value);
Close();
}
else
{
MessageBox.Show(@"Inputs are empty!", @"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}