public override void Invoke(AWSCredentials creds, RegionEndpoint region, int maxItems)
        {
            AmazonRekognitionConfig config = new AmazonRekognitionConfig();

            config.RegionEndpoint = region;
            ConfigureClient(config);
            AmazonRekognitionClient client = new AmazonRekognitionClient(creds, config);

            DescribeProjectsResponse resp = new DescribeProjectsResponse();

            do
            {
                DescribeProjectsRequest req = new DescribeProjectsRequest
                {
                    NextToken = resp.NextToken
                    ,
                    MaxResults = maxItems
                };

                resp = client.DescribeProjects(req);
                CheckError(resp.HttpStatusCode, "200");

                foreach (var obj in resp.ProjectDescriptions)
                {
                    AddObject(obj);
                }
            }while (!string.IsNullOrEmpty(resp.NextToken));
        }