Android app is not working properly in new Android SDk updates?

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I am new in android development.Now I am working in one existing android project . This application is working in android 2.3 but when I update android sdk to 4.4 it is not working properly. Here is one webservice GetCurrentConnectionString() for getting connection string through webservice from asp code . For that they use

httpTransport.call(SOAP_ACTION, envelope)

but it gives an exception .I don't know what exactly happened. I updated all the Android SDKs please help me. I put all the code below for that function.

 public String GetCurrentConnectionString(){
     public final String WSDL_TARGET_NAMESPACE = "http://tempuri.org/";
        final String OPERATION_NAME = "GetCurrentConnectionString";             
        final String SOAP_ACTION = WSDL_TARGET_NAMESPACE + OPERATION_NAME;

        SoapObject request = new SoapObject(WSDL_TARGET_NAMESPACE,OPERATION_NAME);
        SoapSerializationEnvelope envelope = new      SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.dotNet = true;     
            envelope.setOutputSoapObject(request);
        HttpTransportSE httpTransport = new HttpTransportSE(SOAP_ADDRESS);
        Object response=null;
        try
        {  
            httpTransport.call(SOAP_ACTION, envelope);
            response = envelope.getResponse().toString();    
        }
         catch (Exception e) { 

             response="Exception"; 
         }
        return response.toString(); 
}