private void button2_Click(object sender, EventArgs e)
{
if (ldb.CountBorrow(textID.Text) > LibraryDB.MaxBorrow)
{
MessageBox.Show("You can only borrow 3 books! ");
}
else if (ldb.BookStock(textbno.Text) == 0)
{
string erd = ldb.EarliestReturn(textbno.Text);
MessageBox.Show("Out of stock, the earliest return date is " + erd);
}
else if (ldb.Borrowed(textID.Text, textbno.Text))
{
MessageBox.Show("You can only borrow the same book once! ");
}
else
{
ldb.Borrow(textID.Text, textbno.Text);
refreshlistview();
MessageBox.Show("Borrow succeed! ");
}
}