Send nullable int from Android to C# web service

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http://stackoverflow.com – I want to call a JSON C# web service that receives the following parameters: getMensajesByParameters(int param1, int param2, int? param3) Notice that the third parameter is defined as a int?? That means that is a "nullable int". By the other side I am writing an Android application to call the service. I am sending the parameters like the one described above. HttpPost postRequest = new HttpPost(PreferenceManager.getDefaultSharedPreferences(actividad.getBaseContext()).getString(actividad.getString(R.string.server_address_key),"") + "getMensajesByParameters"); List& (HowTos)