public string SerializeBatchRequestToFile(BatchRequest litleBatchRequest, string filePath)
{
filePath = _litleFile.CreateRandomFile(_requestDirectory, Path.GetFileName(filePath), "_temp_litleRequest.xml",
_litleTime);
var tempFilePath = litleBatchRequest.Serialize();
_litleFile.AppendFileToFile(filePath, tempFilePath);
return filePath;
}