private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
frmSach fn = new frmSach();
bool Exist = ExistForm(fn);
if (Exist)
{
return;
}
fn.MdiParent = this;
fn.Show();
}
private void btnQuanSach_Click(object sender, EventArgs e)
{
frmSach f = new frmSach();
f.ShowDialog();
}
