private void nhânViênToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Hide();
Dangnhap tc = new Dangnhap();
tc.Show();
}
private void đăngNhậpToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Hide();
Dangnhap dn = new Dangnhap();
dn.Show();
}
private void toolStripButton2_Click(object sender, EventArgs e)
{
Form child = this.MdiChildren.OfType <Dangnhap>().FirstOrDefault();
if (child == null)
{
Dangnhap fm = new Dangnhap();
fm.MdiParent = this;
fm.StartPosition = FormStartPosition.CenterScreen;
fm.chungthucTK += DangNhapThanhCong;
fm.Show();
return;
}
child.Activate();
}