怎樣獲取windows phone8手機內的電池電量從1%-100%之間的變化，請問這源代碼怎麽寫？詳細說明

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">

<StackPanel>

<Button Content="獲取電池狀態信息" Click="Button_Click" />

<TextBlock x:Name="tbInfo" FontSize="25" />

</StackPanel>

</Grid>

C#:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Navigation;

using Microsoft.Phone.Controls;

using Microsoft.Phone.Shell;

using PhoneApp14.Resources;

using Windows.Phone.Devices.Power;

namespace PhoneApp14

{

public partial class MainPage : PhoneApplicationPage

{

// Constructor

public MainPage()

{

InitializeComponent();

}

private void Button_Click(object sender, RoutedEventArgs e)

{

// 獲取當前手機默認電池的Battery實例

var myBattery = Battery.GetDefault();

// 獲取剩余電量

int pc = myBattery.RemainingChargePercent;

// 獲取剩余續航時間

TimeSpan tsp = myBattery.RemainingDischargeTime;

string msg = string.Format("當前可用電量：{0}%\n 估計剩余時間：{1}天{2}小時{3}分{4}秒", pc, tsp.Days, tsp.Hours, tsp.Minutes, tsp.Seconds);

this.tbInfo.Text = msg;

}

}

}