Detecting a network connection

Check the ispluggedin method of the networkconnection class.

"Scott Leonard" <no**@none.com> wrote in message
news:3f**********@127.0.0.1...

Hello -

I'm writing an application that will be used on "sometimes connected"
devices (laptops, tablets).

In C#, what is the best way to detect whether a network connection is
present? I'd rather not rely on a network request timing out - the detection process must be very quick.

Thanks in advance,
Scott


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Scott Leonard wrote:

Hello -

I'm writing an application that will be used on "sometimes connected"
devices (laptops, tablets).

In C#, what is the best way to detect whether a network connection is
present? I'd rather not rely on a network request timing out - the
detection process must be very quick.

Try System.Windows.Forms.SystemInformation.Network. It is, of course,
true when a network connection is present.
HTH,

Christina Androne

> In C#, what is the best way to detect whether a network

connection is present?

Use WMI, like so:

using System;
using System.Management;
using System.Windows.Forms;

namespace Tests {
public class NetworkProbe {
public static void Main(string []args) {
ObjectQuery objectQuery = new ObjectQuery(
"select * from Win32_NetworkAdapter " +
"where NetConnectionStatus=2"); // 2 means connected

ManagementObjectSearcher searcher =
new ManagementObjectSearcher(objectQuery);

int connectedNetworks = searcher.Get().Count;

if (connectedNetworks > 0) {
Console.WriteLine("There are {0} connected network interfaces",
connectedNetworks);
} else {
Console.WriteLine("There is no network connection present");
}
}
}
}

That should do it,
-JG