private void btnSaveKhachHang_Click(object sender, EventArgs e)
{
//var currentCustomer = GetKhachHang();
if (ValidationData())
{
if (flag)
{
customerDAL.Add(GetKhachHangToAdd());
this.Hide();
}
else
{
customerDAL.Update(GetKhachHangToUpdate());
this.Hide();
}
}
}