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Thread: Detecting network connection loss

  1. #1

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    Exclamation Detecting network connection loss

    I am writing a program in vb 2010 express that relies on being connected to the internet, I want to be able to capture a Windows Message and close my program or log when the network connection is lost, either by Wifi being turned off or the network cable being unplugged.

    I am using My.Computer.Network.Ping() to determine if it is connected when the application starts, but I need to be able to monitor it on an ongoing basis. I assume there is a Windows Message that gets broadcasted as the network adaptor status changes, can anyone provide me a chunk of code that would capture this?

    Any assistance is greatly appreciated.

    ~probiefireman

  2. #2
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    Re: Detecting network connection loss

    there might be... there might not be... but I can think of a case where it wouldn't work:
    the internet connection goes down but the WiFi connection, or the connection to the router/network is still good... I've had cases where the modem disconnects, but the computer is still connected to the router (separate from the modem) which is still up, so it doesn't always realize the internet connection is down.

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  3. #3
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    Re: Detecting network connection loss

    If its for local network its possible otherwise for WAN network or other it would prove to be difficult though do-able.

    http://msdn.microsoft.com/en-us/libr...(v=vs.90).aspx

    As An Example;

    Code:
    If My.Computer.Network.Ping("198.01.01.01") Then
       MsgBox("Server pinged successfully.")
    Else
       MsgBox("Ping request timed out.")
    End If
    or

    Code:
    If My.Computer.Network.Ping("www.cohowinery.com",1000) Then
       MsgBox("Server pinged successfully.")
    Else
       MsgBox("Ping request timed out.")
    End If

  4. #4
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    Re: Detecting network connection loss

    I'mnot sure if this thread is still 'active' but I wouldn't recommend Pinging as it consumes network bandwidth.

    Presumably there are parts of your program that will require to access something over the network. Should the network not be avaiable when accessing, an Exception will be thrown, all you need to do is Catch that exception and do whatever you need to do under those circumstances.

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