public string Serialize()
{
var xmlHeader = generateXmlHeader();
const string xmlFooter = "</batchRequest>\r\n";
batchFilePath = litleFile.createRandomFile(requestDirectory, null, "_batchRequest.xml", litleTime);
litleFile.AppendLineToFile(batchFilePath, xmlHeader);
litleFile.AppendFileToFile(batchFilePath, tempBatchFilePath);
litleFile.AppendLineToFile(batchFilePath, xmlFooter);
tempBatchFilePath = null;
return batchFilePath;
}