data.cs

private void MergeDocument(string Filename, object Data)
{
    // create a new PassingObject that is used to send
    // data to the ProcessingApplication using pipes
    PassingObject dataObject = new PassingObject()
    {
        Data = JsonConvert.SerializeObject(Data),
        Document = File.ReadAllBytes(Filename)
    };

    // call the processing app and pass the data object
    ReturningObject returnObject = ParallelProcessing.CallProcessingApp(dataObject);

    // create destination folder if it doesn't exists
    Directory.CreateDirectory(sResultsFolder);

    // write the returned byte array as a file
    File.WriteAllBytes(sResultsFolder + "\\" + 
      Path.GetFileNameWithoutExtension(Filename) + 
      ".pdf", returnObject.Document);
}