private void btnThemKhacHang_Click(object sender, EventArgs e)
{
try
{
FormThemKhachHang themkh = new FormThemKhachHang();
DialogResult r = themkh.ShowDialog();
if (r == DialogResult.OK)
{
themkh.Close();
}
else if (r == DialogResult.Cancel)
{
themkh.Close();
}
}
catch
{
}
}