private void BtnUpdate_Click(object sender, EventArgs e)
{
b = new Bll.ClsBooks(Convert.ToInt32(dgvBooks.SelectedRows[0].Cells["BookCode"].Value));
FrmBook fb = new FrmBook(b, "update");
fb.Show();
}
private void BtnAdd_Click(object sender, EventArgs e)
{
FrmBook fb = new FrmBook();
fb.Show();
}