constantly checking internet connection

[Nikola Bucic]

Could someone tell me how can I constantly check if I'm connected to
internet and if possible to determine what type of connection is it.

My best shot wright now is to have a timer which will periodicaly call
API to check whether am I connected or not

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

And that's the best option IMO, in the handler you could check for the kind
of connectivity you want and send an event to the UI in case you need to.
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Nikola Bucic" <ni**********@g mail.com> wrote in message
news:11******** **************@ g44g2000cwa.goo glegroups.com.. .

Could someone tell me how can I constantly check if I'm connected to
internet and if possible to determine what type of connection is it.

My best shot wright now is to have a timer which will periodicaly call
API to check whether am I connected or not

[Vadym Stetsyak]

If you want to check if there is an ability to connect to specific server on
the internet you can
check internet connection, performimg basic network operation ( connection )
System.Net.Sock ets

TcpClient tcpClient = new TcpClient ();
tcpClient.Conne ct ("your_server.c om", 80);
//Connection is present
tcpClient.Close ();

Generally connection means that there will be server and client. As I
understood you're in the client's role?
if so it is only necessary to check the accessability of the server in order
to determine if connection is present.

--
Vadym Stetsyak aka Vadmyst
http://vadmyst.blogspot.com

"Nikola Bucic" <ni**********@g mail.com> wrote in message
news:11******** **************@ g44g2000cwa.goo glegroups.com.. .

Could someone tell me how can I constantly check if I'm connected to
internet and if possible to determine what type of connection is it.

My best shot wright now is to have a timer which will periodicaly call
API to check whether am I connected or not

[Nikola Bucic]

it's not important whether I'm on server or on client side. I just want
to have constantly monitoring over internet connection and when my PC
become online run some code

[Vadym Stetsyak]

You mean hardware connection? Smth like when ethernet cable is plugged or
unplugged?

--
Vadym Stetsyak aka Vadmyst
http://vadmyst.blogspot.com

"Nikola Bucic" <ni**********@g mail.com> wrote in message
news:11******** *************@g 49g2000cwa.goog legroups.com...

it's not important whether I'm on server or on client side. I just want
to have constantly monitoring over internet connection and when my PC
become online run some code

[Rahul Goel]

You can develop an windows Service which will fire an API to check whether
ur PC is conencted to Internet or not
and You can get its status using Notify Icon.
--
Best Regards
Rahul Goel

[Goran Sliskovic]

"Nikola Bucic" <ni**********@g mail.com> wrote in message
news:11******** *************@g 49g2000cwa.goog legroups.com...

it's not important whether I'm on server or on client side. I just want
to have constantly monitoring over internet connection and when my PC
become online run some code

"Internet connection" is very hard to define. You can be connected over LAN,
through ethernet. You may have dial-up connection, wireless, DSL or
something else. Even if your ethernet interface is up, that does not mean
that you can connect to internet. There may be firewalls that restrict
access (totally or to some services). IMHO, if you need to connect to some
server to do some work, don't check for internet connection, check for
servers availability. Try to connect and if it works, it works :)

Regards,
Goran

[Nikola Bucic]

Rahul, I want it to be a Service, but can you tell me do I need timer
to check Connection state or is there some windows message(s) that I
can trap?

Goran Sliskovic, I call API InternetGetConn ectedState. Regarding
defining Internet connection, I'm quite satisfied with that API.
Here is dllCall for mentioned API

[DllImport("Wini net", CharSet=CharSet .Auto)]
static extern bool InternetGetConn ectedState(ref
InternetConnect ionState lpdwFlags, int dwReserved);

[Michael Voss]

Nikola Bucic wrote:

[...snip...]

Goran Sliskovic, I call API InternetGetConn ectedState. Regarding
defining Internet connection, I'm quite satisfied with that API.
Here is dllCall for mentioned API

[...snip...]

Actually, it's impossible to correctly identify if a computer is connected
to "the internet" or not.

InternetGetConn ectedState just reads the settings of the default connection
of IE returning "true" whenever the connection is to be established via a
LAN. If you are using Dial-Up-Connections it does not take into account how
autodial is set up (at least not correctly). Finally, it needs a complete
installation and configuration of at least IE 4 to work at all.