Check internet connection

System.Net.WebClient   //Name space

Solutions 1:  

Public Void InternetConnCheck()
{     

     try

     { 

        WebClient Client=new WebClient ();

       Using (var stream = client.OpenRead("http://www.google.com")

       {       
           Messagebox.show("Connection is Open"); 

       }

     catch

     {

          Messagebox.show("Connection Not available");  

     }   

}

Solutions 2: 

Public Void InternetConnCheck()
{     
     try 
     {       

       System.Net.IPHostEntry i = System.Net.Dns.GetHostEntry("www.google.com");

               Messagebox.show("Connection available");        
     }
     catch
     { 
        Messagebox.show("Connection Not available"); 
     }  

}

Solutions 3: 

bool InternetConnection = new Ping().Send

                          ("www.google.co.in").Status == IPStatus.Success;