is there a simple code in C# to check if pc is connected to internet?

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atleast the code could also identify if it is connected and not connected anymore pleasee help because i want i to put into my project i have really no idea how to do it. thanks in advance =)

Posted 22-Feb-12 13:19pm

newbie011292

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4 solutions

Solution 4

Check this Tip/Trick
Testing Internet Connectivity[^](Contains 5 different ways)

Posted 28-Feb-12 7:29am

thatraja

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Espen Harlinn 28-Feb-12 14:24pm

Nice find :)

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Espen Harlinn · Accepted Answer · 2012-02-22T13:33:00

Solution 1

How about:Get the Available Network Connections Using WMI[^]

Best regards
Espen Harlinn

Posted 22-Feb-12 13:33pm

Espen Harlinn

Comments

Orcun Iyigun 22-Feb-12 19:42pm

Nice link. 5ed.

Espen Harlinn 23-Feb-12 11:15am

Thank you, Orcun :)

Sergey Alexandrovich Kryukov 22-Feb-12 21:17pm

Agree, a 5.
--SA

Espen Harlinn 23-Feb-12 11:16am

Thank you Sergey :)

newbie011292 23-Feb-12 11:12am

thanks

thatraja 28-Feb-12 13:31pm

Did you forget to accept his answer?

thatraja 28-Feb-12 13:31pm

5!

Espen Harlinn 28-Feb-12 13:44pm

Thank you thatraja :)

**Orcun Iyigun** · Accepted Answer · 2012-02-22T13:41:00

Solution 2

Use InternetGetConnectedState[^] function. And then use InternetCheckConnection[^] function. A sample code:

C#

using System; 
using System.Runtime; 
using System.Runtime.InteropServices;  
public class InternetCS 
{       
  [DllImport("wininet.dll")]     
  private extern static bool InternetGetConnectedState( out int Description, int ReservedValue );
  public static bool IsConnectedToInternet( )     
  {         
    int Desc ;         
    return InternetGetConnectedState( out Desc, 0 ) ;     
  } 
}

-OR-

C#

WebClient web = new WebClient();  
try 

{  
  web.DownloadData("http://www.codeproject.com");  
}  
catch (WebException ex)  
{  
  Console.WriteLine("Could not connect");  
}

If it fails you do not have conenction. But 1 st way is more reliable in my opinion.

Good luck,
OI

Posted 22-Feb-12 13:41pm

Orcun Iyigun

Comments

Espen Harlinn 22-Feb-12 19:45pm

Excellent reply - my 5 :)

newbie011292 22-Feb-12 19:54pm

sir i dont understand the 1st sorry im not that good in C#, is this the right way?i got errors too T_T.

public partial class Form1 : Form
{
[DllImport("wininet.dll")]

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

}

private extern static bool InternetGetConnectedState(out int Description, int ReservedValue);

public static bool IsConnectedToInternet()
{
int Desc;
return InternetGetConnectedState(out Desc, 0);
}
}

Sergey Alexandrovich Kryukov 22-Feb-12 21:20pm

Good, my 5, but you should say the truth: second method is not reliable at all. Here is why: imagine CodeProject.com -- God forbid -- gets down for a short while...
--SA

Orcun Iyigun 23-Feb-12 11:40am

Yeah that's right. I know it is not reliable that's why I also mentioned I would rather prefer the first way.

newbie011292 23-Feb-12 11:12am

thanks

Orcun Iyigun 23-Feb-12 11:38am

you are welcome. hope it helped.

thatraja 28-Feb-12 13:30pm

You covered 2 ways, 5!

Orcun Iyigun 28-Feb-12 19:40pm

thank you thatraja! I am happy to see that you like my answers gives me such happiness.

Phaneendra Varanasi · Accepted Answer · 2012-02-22T17:03:00

Solution 3

C#

try
{
System.Net.IPHostEntry = System.Net.Dns.GetHostByName("www.google.com");
return true;
}
catch
{
return false; // host not reachable.
}

Posted 22-Feb-12 17:03pm

Phaneendra Varanasi

Comments

newbie011292 23-Feb-12 11:13am

thanks