protected void btnChkCondition_Click(object sender, EventArgs e)
{
if (txtBookNumber.Text == null || txtBookNumber.Text.Equals(""))
{
lblError.Text = "Book Number is not allow to be null";
txtBookNumber.Focus();
}
else if (DAO.checkInt(txtBookNumber.Text) == false)
{
lblError.Text = "Book Number is numberic";
txtBookNumber.Focus();
}
else
{
DataView dv = new DataView(BookDAO.GetDataTableBook());
dv.RowFilter = "bookNumber = " + txtBookNumber.Text;
if (dv.Count != 0) //book exist
{
int availableCopy = CopyDAO.getAvailableCopy(int.Parse(txtBookNumber.Text)); //số lượng bản copy A
if (availableCopy > 0)
{
lblError.Text = "This book having " + availableCopy + " copies available, you can borrow them";
}
else
{
lblError.Text = "";
btnReserve.Enabled = true;
}
}
else
{
lblError.Text = "Oops! this book number is not exist!";
}
}
}