public async Task <DateTime> LatestSync(FolderMapping mapping)
        {
            if (mapping == null || mapping.FriendlyName == null)
            {
                return(DateTime.MinValue);
            }

            string path = folderRoot + mapping.FriendlyName + "/";

            if (!await client.DirectoryExistsAsync(path))
            {
                return(DateTime.MinValue);
            }

            FtpListItem[] folders = await client.GetListingAsync(path);

            if (folders.Length == 0)
            {
                return(DateTime.MinValue);
            }

            List <DateTime> folderDateTimes = folders.Select(x => DateTimeDirUtils.GetDirDateTime(x.Name)).ToList();

            folderDateTimes.Sort();
            return(folderDateTimes.Last());
        }
        private async Task <DateTime> LatestSync(string friendlyName)
        {
            string path = folderRoot + friendlyName + "/";

            if (!await client.DirectoryExistsAsync(path))
            {
                return(DateTime.MinValue);
            }

            FtpListItem[] folders = await client.GetListingAsync(path);

            if (folders.Length == 0)
            {
                return(DateTime.MinValue);
            }

            List <DateTime> folderDateTimes = folders.Select(x => DateTimeDirUtils.GetDirDateTime(x.Name)).ToList();

            folderDateTimes.Sort();
            return(folderDateTimes.Last());
        }