Web services returning null

String line = null;
	 
	try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("Valid url");
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
line = EntityUtils.toString(httpEntity);
Displaymsg(line);
	}
	catch(Exception ex)
	{
		Displaymsg(ex.getMessage());
	}

try {
         HttpClient httpclient = new DefaultHttpClient();
         HttpPost post = new HttpPost("Valid url");
         
         HttpResponse response = httpclient.execute(post);
         HttpEntity entity = response.getEntity();
         Returned = EntityUtils.toString(entity);
         Toast.makeText(this, Returned, Toast.LENGTH_LONG).show();
       } catch ( IOException ioe ) {
        ioe.printStackTrace();
       }