public FThemSinhVien(string strMaSV)
        {
            InitializeComponent();
            this.strMaSV          = strMaSV;
            txtMaSinhVien.Enabled = false;
            btnThem.Enabled       = false;

            txtMaSinhVien.Text = strMaSV;
            DataTable tb = new DataTable();

            tb                   = CSinhVien_BLL.loadSinhVienInfor(strMaSV);
            txtHoTen.Text        = tb.Rows[0]["HoTen"].ToString();
            txtDiaChi.Text       = tb.Rows[0]["DiaChi"].ToString();
            txtThongTinKhac.Text = tb.Rows[0]["CacThongTin"].ToString();
            dtmpNgaySinh.Value   = DateTime.Parse(tb.Rows[0]["NgaySinh"].ToString());

            picImageSV.Image = convertDataToImage(tb.Rows[0]["HinhAnh"].ToString());

            if (tb.Rows[0]["GioiTinh"].ToString() == "True")
            {
                rdoNam.Checked = true;
                rdoNam.Select();
                rdoNu.Checked = false;
            }
            else
            {
                rdoNam.Checked = false;
                rdoNu.Checked  = true;
                rdoNu.Select();
            }
        }