public async Task <IActionResult> CreateCourseStage(CourseStage courseStage)
        {
            if (ModelState.IsValid == false)
            {
                return(BadRequest("Invalid data"));
            }

            try
            {
                await _courseStageManager.CreateAsync(courseStage);

                return(Ok());
            }
            catch (Exception ex)
            {
                return(StatusCode(500, ex.Message));
            }
        }
        public async Task <IActionResult> UpdateAnswer(CourseStage courseStage)
        {
            if (ModelState.IsValid == false)
            {
                return(BadRequest("Invalid data"));
            }

            try
            {
                var course = await _courseStageManager.UpdateAsync(courseStage);

                if (course == null)
                {
                    return(NotFound());
                }

                return(Ok(course));
            }
            catch (Exception ex)
            {
                return(StatusCode(500, ex.Message));
            }
        }