How Do I Send Android Data To .Net Database.

i just created app that detect device imei number and battery level.
in .net i crated a simple web api which shows details from database as xml file in we browser.
++++android+++
package com.example.vetriselvanv.im;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.telephony.TelephonyManager;
import android.widget.TextView;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends ActionBarActivity {
TextView textView, textView3;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
textView = (TextView) findViewById(R.id.textView);
String string = tm.getDeviceId();
textView.setText("IMEI NUMBER IS" + string + "fhkj");
textView3 = (TextView) this.findViewById(R.id.textView3);
btrylevel();
postData();
}


private void btrylevel() {
BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
context.unregisterReceiver(this);
int rawlevel = intent.getIntExtra("level", -1);
int scale = intent.getIntExtra("scale", -1);
int level = -1;
if (rawlevel >= 0 && scale > 0) {
level = (rawlevel * 100) / scale;
}
textView3.setText("Battery Level: " + level + "%");
}
};
IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryLevelReceiver, batteryLevelFilter);
}

public void postData() {
TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
textView = (TextView) findViewById(R.id.textView);
final String string = tm.getDeviceId();
textView.setText(string);
textView3 = (TextView) this.findViewById(R.id.textView3);
btrylevel();
// Create a new HttpClient and Post Header
final HttpClient httpclient = new DefaultHttpClient();
final HttpPost httppost = new HttpPost("http://localhost:50554/api/Default");
BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
context.unregisterReceiver(this);
int rawlevel = intent.getIntExtra("level", -1);
int scale = intent.getIntExtra("scale", -1);
int level = -1;
if (rawlevel >= 0 && scale > 0) {
level = (rawlevel * 100) / scale;
}
textView3.setText("Battery Level: " + level + "%");
try {
// Add your data
List<namevaluepair> nameValuePairs = new ArrayList<namevaluepair>(3);
nameValuePairs.add(new BasicNameValuePair("Id", "5"));
nameValuePairs.add(new BasicNameValuePair("btrylevel", textView3.toString()));
nameValuePairs.add(new BasicNameValuePair("imei", string));

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

// Execute H

+++++++++.NET+++++++++++++
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;

namespace WebApi.Controllers
{
public class DefaultController : ApiController
{
Database2Entities db=new Database2Entities();
// GET: api/Default
public IEnumerable<device> Get()
{
return db.Devices.AsEnumerable();
}

// GET: api/Default/5
public Device Get(int id)
{
return db.Devices.Where(x => x.Id == id).FirstOrDefault();
}

// POST: api/Default
public Device Post([FromBody]int id,int imei,int btrylevel)
{
Device device = new Device()
{
Id = id,
btrylevel = btrylevel,
imei = imei

};
db.Devices.Add(device);
db.SaveChanges();
return device;
}

// PUT: api/Default/5
public void Put(int id, [FromBody]string value)
{
}

// DELETE: api/Default/5
public void Delete(int id)
{
}
}
}