private static string CreateMessage(DeleteObjectsResponse response)
{
if (response == null)
throw new ArgumentNullException("response");
string message = string.Format(CultureInfo.InvariantCulture,
"Error deleting objects. Deleted objects: {0}. Delete errors: {1}",
response.DeletedObjects == null ? 0 : response.DeletedObjects.Count,
response.DeleteErrors == null ? 0 : response.DeleteErrors.Count);
return message;
}