Code snippet for Atrribute Query

try {
      string aaURL = "https://idp.testshib.org:8443/idp/profile/SAML2/SOAP/AttributeQuery";
      //Testing subject
      NameId subje = new NameId(userName,null,null,SamlNameIdentifierFormat.Unspecified,aaURL);
      
      //Testing subject
      Subject subject = new Subject(new NameId(userName));
      SubjectConfirmation subjectConfirmation = new SubjectConfirmation(SamlSubjectConfirmationMethod.Bearer);
      SubjectConfirmationData subjectConfirmationData = new SubjectConfirmationData();
      subjectConfirmationData.Recipient = aaURL;
      subjectConfirmation.SubjectConfirmationData = subjectConfirmationData;
      subject.SubjectConfirmations.Add(subjectConfirmation);
      
      // Another subject version
      AttributeQuery attributeQuery = new AttributeQuery();
      attributeQuery.Subject = subject;
      attributeQuery.Destination = aaURL;
      attributeQuery.Issuer = new Issuer(Global.entityId);
      attributeQuery.Attributes.Add(new ComponentPro.Saml2.Attribute() { FriendlyName = "sn" });
      
      // Third version
      //attributeQuery.Subject = new Subject(samlAssertion.Subject.NameId);
      
      attributeQuery.Sign(x509Certificate);
      System.Diagnostics.Trace.WriteLine("Trying to get attributes from AA");
      System.Diagnostics.Trace.WriteLine("AA query " + attributeQuery.GetXml().OuterXml);
      System.Diagnostics.Trace.WriteLine("AA Subject " + attributeQuery.Subject.ToString());

      ArtifactResponse artifactResponse = ArtifactResponse.SendSamlMessageReceiveAftifactResponse(aaURL, attributeQuery);

      Response attrResponse;
      attrResponse = new ComponentPro.Saml2.Response(artifactResponse.Message);
      System.Diagnostics.Trace.WriteLine("AA reponse " + attrResponse.GetXml().OuterXml);

      }
      catch (Exception e)
      {
          System.Diagnostics.Trace.WriteLine("Execption: " + e.ToString());
          //throw;
      }