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