private void khoToolStripMenuItem_Click(object sender, EventArgs e)
{
frmKho frm = new frmKho();
this.Hide();
frm.Show();
}
private void btnKho_ItemClick(object sender, ItemClickEventArgs e)
{
if (KiemTraTonTai("frmKho") == null)
{
foreach (Form frm1 in MdiChildren)
{
frm1.Close();
}
frmKho frm = new frmKho();
frm.MdiParent = this;
frm.Show();
}
}
