private void buttonItem_khachhang_Click(object sender, EventArgs e)
{
if (frkh == null || frkh.IsDisposed)
{
frkh = new frKhachhang();
frkh.MdiParent = this;
frkh.Show();
}
else
{
frkh.Activate();
}
}
private void buttonX_addKH_Click(object sender, EventArgs e)
{
if (frkh == null || frkh.IsDisposed)
{
frkh = new frKhachhang();
frkh.MdiParent = frMain.ActiveForm;
frkh.Show();
}
else
{
frkh.Activate();
}
}