how to verify that an internet connection exists from a windows .net application? (windows, internet, .net, C#, information technology, programming, software development)

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Time: 10:56 - Jul 27, 2007 Asked by: dustPuppy Status: Answered Points: 75

how to verify that an internet connection exists from a windows .net application?

I need to verify in the user is connected to the internet. What is the best, i.e. quickest way to do this?

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there is sample code here that may help but note one of the comments. Are you connected to Lan or Internet so suggestion is to use HttpRequest
http://www.dotnet247.com/247reference/msgs/58/2919...

I guess you could also ping a website
http://www.codeproject.com/dotnet/CSharpPing.asp

Expert:	nidhi
Date:	Jul 27, 2007
Time:	11:46

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Thanks for the references, nidhi.
I decided to use the ping approach like this:
public bool CheckHostReachable(string host)
{
System.Net.NetworkInformation.Ping p = new Ping();

PingReply pingReply = p.Send(host, 5000);
return (pingReply.Status == IPStatus.Success);
}

I found out that there is also an asynchronous way of pinging, but since I needed the next action to be dependent on whether I had connectivity or not, I decided to use the synchronous way.

Expert:	dustPuppy
Date:	Jul 28, 2007
Time:	06:21

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Yea, I think ping would be the best, at least then it doesnt care about how internet connection is made i.e. lan or modem. Depending on how speed is an issue when checking, you might want to think about hops. Not sure if you can specify how many hops you can make though.

Expert:	nidhi
Date:	Jul 28, 2007
Time:	10:21

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nidhi:	60
dustPuppy:	15

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