public void UploadFile()
        {
            // Arrange
            String        fileName = "Test.txt";
            NoteViewModel vm       = new NoteViewModel();

            vm.Cid = TestNote.cid;
            String            dstPathFile = Path.Combine(Config.GetConfig().PathCustomerFolders, vm.Cid.ToString(), fileName);
            FrmNoteController controller  = new FrmNoteController();

            // mocking - style 1
            Mock <HttpPostedFileBase> mockFile = new Mock <HttpPostedFileBase>();

            mockFile.Setup(x => x.FileName).Returns(fileName);
            mockFile.Setup(x => x.ContentLength).Returns(1);
            vm.AttachmentFile = mockFile.Object;

            // mocking - style 2
            //HttpPostedFileBase mockFile = Mock.Of<HttpPostedFileBase>();
            //Mock.Get(mockFile).Setup(x => x.FileName).Returns(fileName);
            //Mock.Get(mockFile).Setup(x => x.ContentLength).Returns(1);
            //vm.AttachmentFile = mockFile;

            // Act
            MethodInfo callUploadFile = controller.GetType().GetMethod("UploadFile", BindingFlags.NonPublic | BindingFlags.Instance);

            callUploadFile.Invoke(controller, new object[] { vm });

            // Assert
            Assert.AreEqual(fileName, vm.Attachment);
            mockFile.Verify(x => x.SaveAs(dstPathFile));  // style 1
            //Mock.Get(mockFile).Verify(x => x.SaveAs(dstPathFile)); // style 2
        }