private static async void Save(string lessonFolder, string dateModified)
        {
            string codePath = lessonFolder + @"\code.pptx";
            var    lesson   = new Lesson();

            lesson.Id           = DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt");
            lesson.Name         = Path.GetFileName(lessonFolder);
            lesson.DateModified = dateModified;
            lesson.Slides       = FileHelper.GetLessonSlidesNumber(lesson.Name);

            var slidesData = PowerpointHelper.GetSlidesData(codePath);

            lesson.Teacher_Id = slidesData[0].TeacherId;
            lesson.Subject    = slidesData[0].Subject;

            var lessonSaved = await WebHelper.AddLesson(lesson);

            if (lessonSaved == "true")
            {
                int _questionNumber = 0;
                for (int i = 0; i < slidesData.Count; i++)
                {
                    var question = slidesData[i].Question;
                    if (question != null)
                    {
                        question.Id        = 1;
                        question.Lesson_Id = lesson.Id;
                        _questionNumber   += 1;
                        question.Number    = _questionNumber;
                        WebHelper.AddQuestion(question);
                    }
                }
            }
            else
            {
                MessageBox.Show($"Lesson {lesson.Name} not saved!");
            }
        }