How to check internet connection in C#

A simple example, for check internet connection is avilable or not
CODE:

1 :  Using System.Net ;

2 :  try{

3 :  HttpWebRequest webReq = (HttpWebRequest)HttpWebRequest.Create("abc.com");

4 :  HttpWebResponse webRes= (HttpWebResponse)webReq.GetResponse();

5 :  if (HttpStatusCode.OK == webRes.StatusCode)

6 :  {

7 :  webRes.Close();

8 :  // write code here...........

9 :  }

10 :  }

11 :  catch (Exception ex)

12 :  {

13 :  MessageBox.Show("Unable to connect");

14 :  }