fo-dicom - How can I download dcm images from PACS and save them?

I'm trying to download dcm image from PACS server, but this is generating an empty dcm file.

Following is the code:

public void VisoresPacsController(string ipAddress, string aeTitle, string accessId, int port)
{
    /*
    this.ipAddress = ipAddress;
    this.aeTitle = aeTitle;
    this.accessId = accessId;
    this.port = port;
    visores.Add(new VisorCommandLine("Radiant", ""));
    ///new DicomCStoreRequest.
    */
    DicomClient client = new DicomClient();
    var query = DicomCFindRequest.CreateImageQuery("1.2.250.1.31.2.723.19980722.113224.11597", "1.2.250.1.31.3.723.19980722.113224.11597");
    client.AddRequest(query);
    query.OnResponseReceived = onResponse;
    client.Send("70.38.12.40", 4242, false, "THS", "ORTHANC");
}

public void onResponse(DicomCFindRequest req, DicomCFindResponse res)
{
    DicomDataset dataset = res.Dataset;
    dataset.Add(DicomTag.SOPClassUID, "1.2.250.1.31.4.723.19980722.113224.11597");
    //dataset.Add(DicomTag.StudyInstanceUID, GenerateUid());
    //dataset.Add(DicomTag.SeriesInstanceUID, GenerateUid());
    //dataset.Add(DicomTag.SOPInstanceUID, GenerateUid());
    DicomFile dicomFile = new DicomFile(dataset);
    dicomFile.Save(@"C:\Users\Developer 13\Desktop\dicomfile.dcm");
}

My code