问很难从android应用程序向.NET web服务发出soap请求

EN

public class LoginCheck extends Activity {

    private static final String SOAP_ACTION = "http://tabtobook.org/Login";
    private static final String METHOD_NAME = "Login";
    private static final String NAMESPACE = "http://tabtobook.org/";
    private static final String URL = "http://192.168.1.2/TabBookServices/Users.asmx";
    private TextView tv;

    @Override
    public void onCreate(Bundle savedInstanceState) {
         /** Called when the activity is first created. */
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv=(TextView)findViewById(R.id.tv);
        ServiceCall();
    }
    public void ServiceCall()
    {
        try{
        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        String A="user1";
        request.addProperty("Username", A);
        String B="user1";
        request.addProperty("Password", B);

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.dotNet=true;
        envelope.setOutputSoapObject(request);

        androidHttpTransport.call(SOAP_ACTION, envelope);

         SoapObject result = (SoapObject)envelope.getResponse();
         tv.setText(result.toString());
        }       

        catch (final IOException e)
        {
            ((TextView) findViewById(R.id.tView)).setText("test3");
            e.printStackTrace();

        } catch (final XmlPullParserException e)

        {
            e.printStackTrace();
        } catch (final Exception e)

        {
            e.printStackTrace();
        }
    }
}

targetNamespace="http://tabtobook.org/", location="http://localhost/TabBookServices/Users.asmx, soapAction="http://tabtobook.org/Login"

private class DownloadWebPageTask extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... urls) {
        String response = "";
        try {

                SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
                HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
                String A="user2";
                request.addProperty("Username", A);
                String B="user2";
                request.addProperty("Password", B);
                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                envelope.dotNet=true;
                envelope.setOutputSoapObject(request);

                androidHttpTransport.call(SOAP_ACTION, envelope);
                SoapObject result = (SoapObject)envelope.bodyIn; 
                response=result.toString();                     

                }

             catch (Exception e) {
                e.printStackTrace();

            }
        return response;
    }

    @Override
    protected void onPostExecute(String result) {
        tv.setText(result);
    }
}

public void ServiceCall() {
    DownloadWebPageTask task = new DownloadWebPageTask();
    task.execute(); 
    }
}

if(result.equals("LoginResponse{LoginResult=1; }"))