private async Task GetMainPageForumsAsync()
        {
            var forumCategoryEntities = await _db.GetMainForumsList();

            if (forumCategoryEntities.Any())
            {
                foreach (var forumCategoryEntity in forumCategoryEntities)
                {
                    ForumGroupList.Add(forumCategoryEntity);
                }
#if DEBUG
                ForumGroupList[3].ForumList.Add(ForumManager.AddDebugForum());
#endif
                return;
            }

            forumCategoryEntities = await _forumManager.GetForumCategoryMainPage();

            foreach (var forumCategoryEntity in forumCategoryEntities)
            {
                ForumGroupList.Add(forumCategoryEntity);
            }
            await _db.SaveMainForumsList(ForumGroupList.ToList());
        }