private void QuanLyNhanVien_Load(object sender, EventArgs e)
        {
            CMND = "";
            QuanTriBUS quanTriBUS = new QuanTriBUS();

            bunifuCustomDataGrid1.DataSource = quanTriBUS.LayDanhSachNhanVien();
            string hoTen = quanTriBUS.LayThongTinMotNhanVien(username).ten;

            label2.Text = "Xin chào! " + hoTen;
        }
        private void btnLoadAll_Click(object sender, EventArgs e)
        {
            QuanTriBUS quanTriBUS = new QuanTriBUS();

            bunifuCustomDataGrid1.DataSource = quanTriBUS.LayDanhSachNhanVien();
        }