public string Update(string TenND, DateTime NgaySinh, bool GioiTinh, string DiaChi, string SDT, string TenDangNhap, string MatKhau, string ChucVu)
 {
     if (DateTime.Compare(NgaySinh, DateTime.Now) <= 0)
     {
         try
         {
             NguoiDung.CapNhatThongTin(PhanQuyenNguoiDung.TenDangNhap, TenND, NgaySinh, GioiTinh?1:0, DiaChi, SDT);
             if (NguoiDung.LayThongTin(TenDangNhap).TenND == TenND && NguoiDung.LayThongTin(TenDangNhap).NgaySinh == NgaySinh && NguoiDung.LayThongTin(TenDangNhap).GioiTinh == GioiTinh && NguoiDung.LayThongTin(TenDangNhap).DiaChi == DiaChi && NguoiDung.LayThongTin(TenDangNhap).SDT == SDT)
             {
                 return("successed");
             }
             else
             {
                 return("failed");
             }
         }
         catch
         {
             return("failed");
         }
     }
     else
     {
         return("failed");
     }
 }
        private void frmCapNhatThongTinND_Load(object sender, EventArgs e)
        {
            ChiTietNguoiDung nd = NguoiDung.LayThongTin(PhanQuyenNguoiDung.TenDangNhap);

            txtDiaChi.Text = nd.DiaChi;
            //dtpNgaySinh.Text = nd.NgaySinh.Day =;
            dtpNgaySinh.Text     = nd.NgaySinh.ToString();
            txtSoDienThoai.Text  = nd.SDT;
            txtTenNguoiDung.Text = nd.TenND;
            if (nd.GioiTinh == true)
            {
                rdoNam.Checked = true;
            }
            else
            {
                rdoNu.Checked = true;
            }
            lblThongBao.Text = "";
        }