Internet connection availability notification

[yk63fd01]

Hello,
Is there a way to receive a notification when an internet connection
becomes available and when it becomes unavailable?
Thanks.

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

Hi,

No really, there is not such a concept of as connected to the internet,
you can use one of several workaround ( or all of them )

1- Check if the device has at least one IP different that the localhost
2- See if you can connect to some predefined server/address ( this may fail
due to proxies config. )
3- Try to resolve some name to its IP, in general the DNS is always
accesible even if a proxy exist.

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"yk63fd01" <yk******@gmail.com> wrote in message
news:11**********************@f14g2000cwb.googlegr oups.com...

Hello,
Is there a way to receive a notification when an internet connection
becomes available and when it becomes unavailable?
Thanks.

[yk63fd01]

Hi,

Thanks for the reply. Right now, I have a thread which is attempting
to do ftp transfers, so it does fail in the DNS resolution phase (as
you mentioned above) and sleeps a certain time before trying again.
But, I was hoping to be able to use an interrupt method instead of
polling (as it would be more efficient).

Thanks

[yk63fd01]

One other thing. This doesn't have to be done with pure .NET. Isn't
there a way to do this using the Win32 API? I know some things like
receiving notification of a CD inserted can be done with APIs, but I
can't seem to locate anything for network connectivity.

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

Hi,

AFAIK there is nothing like that, as I said before being "connected to the
internet" is relative , maybe there is somethign when a network adapter
change its configuration, don;t know for sure but even so is the same thing,
it may be connected locally and your remote server is not available

pooling is the only solution I see here.

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"yk63fd01" <yk******@gmail.com> wrote in message
news:11*********************@z14g2000cwz.googlegro ups.com...

One other thing. This doesn't have to be done with pure .NET. Isn't
there a way to do this using the Win32 API? I know some things like
receiving notification of a CD inserted can be done with APIs, but I
can't seem to locate anything for network connectivity.

[yyy]

Set a timer and use this:
http://www.csharphelp.com/archives3/archive499.html

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