public ActionResult Post([FromBody] CreateTaskListRequest request)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest());
            }

            else
            {
                var userExists = _taskService.Users.Any(i => i.UserId == request.UserId && i.IsDeleted != true);
                if (userExists)
                {
                    var itemExists = _taskService.TaskLists.Any(i => i.Title == request.TaskListTitle && i.UserId == request.UserId && i.IsDeleted != true);
                    if (itemExists)
                    {
                        return(BadRequest());
                    }

                    TaskList item = new Models.TaskList();
                    item.TaskListId   = Guid.NewGuid().ToString().Replace("-", "");
                    item.UserId       = request.UserId;
                    item.CreatedOnUtc = DateTime.UtcNow;
                    item.UpdatedOnUtc = DateTime.UtcNow;
                    item.Title        = request.TaskListTitle;
                    _taskService.AddTaskList(item);

                    HttpContext.Response.StatusCode = 201;
                    return(Ok());
                }
                else
                {
                    return(BadRequest());
                }
            }
        }