private void quảnLýKháchHàngToolStripMenuItem_Click(object sender, EventArgs e)
{
frmKhachHang newForm = new frmKhachHang();
newForm.Show();
this.Hide();
}
private void buttonX2_Click(object sender, EventArgs e)
{
frmKhachHang kh = new frmKhachHang();
kh.Show();
//textBox1.Text = dtNgayCN.Text;
}