Check if Internet connection is available with C#

There can be situations when you need to check, whether your application has Internet access. 
Maybe you have to download/upload some file or database, or just run some application check. 
In my case, my application mainly developed based on Service Oriented Architecture. So application must have an Internet connection to work.
There are plenty different ways to archive this. I will describe the one which is very easier first.
This is the method.

System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()

If you want to check whether the internet connection is available on application life time, you can have a timer and check whether the connection is available. If not you can set warning for the user.

Here how I done that in WPF.

using System.Threading;
using System;
namespace Example
{
 public partial class MainWindow : Window
 {
        private Timer timer;
        public MainWindow()
        {
            InitializeComponent();
            if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
            { 
               MessageBox.Show("Internet connection not available, \n Please check your connection");
               return;
            }
            timer = new Timer(UpdateNetworkStatus, null, new TimeSpan(0, 0, 0, 0, 500), new TimeSpan(0, 0, 0, 0, 500));
            lblNetworkStatus.Visibility = Visibility.Collapsed;
        }
        private void UpdateNetworkStatus(object o)
        {
            if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
                lblNetworkStatus.Visibility = Visibility.Visible;
            else
                lblNetworkStatus.Visibility = Visibility.Collapsed;
        }
 }
}

Will clean this a bit and describe the other ways once I got free time.
I just write this blog post because I thought that it will helpful for most of the developers.
Cheers!!!