[WP] Countdown Timer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Threading;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using TimerRun.Resources;

namespace TimerRun
{
    public partial class MainPage : PhoneApplicationPage
    {

        int time = 10;
        DispatcherTimer dispatch;

        public MainPage()
        {
            InitializeComponent();

            dispatch = new DispatcherTimer();
        }

        private void Grid_Loaded_1(object sender, RoutedEventArgs e)
        {
            if (!dispatch.IsEnabled)
            {
                dispatch.Tick += dispatch_Tick;
                dispatch.Interval = new TimeSpan(0,0,1);
                dispatch.Start();
            }
        }

        void dispatch_Tick(object sender, object e)
        {
            time--;
            if (time < 0)
            {
                time = 10;
            }
            displayZone.Text = "" + time;
        }

    }
}