private void frmConfirmBorrow_FormClosing(object sender, FormClosingEventArgs e)
{
if (DialogResult == DialogResult.OK)
{
Loan loan = new Loan();
loan.fkBook = bookid;
loan.fkReader = readerid;
loan.dateOut = System.DateTime.Now;
_controller.Insert(loan);
_controller.Update(loan);
}
}