private void btnChamCong_Click(object sender, EventArgs e)
{
Form frm = new FrmChamCong();
frm.Show();
this.Hide();
}
private void btnChamCong_Click_1(object sender, EventArgs e)
{
HideBtn(btnCTy, btnQLNS, btnLuong);
Form frm = new FrmChamCong();
frm.Show();
this.Hide();
}