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Application Events Sample 

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This sample demonstrates how to use My.Computer.Network events to write network-aware applications.

Security noteSecurity Note

This sample code is provided to illustrate a concept and should not be used in applications or Web sites, as it may not illustrate the safest coding practices. Microsoft assumes no liability for incidental or consequential damages should the sample code be used for purposes other than as intended.

To open the sample file in Solution Explorer

  1. Click Download Sample.

    The File Download message box appears.

  2. Click Open, and on the left column of the zip folder window, click Extract all files.

    The Extraction Wizard opens.

  3. Click Next. You can change the directory that the files will be extracted to, and then click Next again.

  4. Make sure that the Show extracted files check box is selected, and click Finish.

  5. Double-click the sample's .sln file.

    The sample solution is displayed in Solution Explorer. You might get a security warning that says the solution location is not trusted. Click OK to continue.

To run this sample

  • Press F5.


The MainForm contains a StatusStrip control that indicates whether the network connection is currently connected or disconnected. Each time the status of network connectivity changes, the My.Computer.Network.NetworkAvailabilityChanged Event event is raised. The handler for this event resides in the My Project\MyEvents.vb file. To access this file, double-click My Project in Solution Explorer. On the Application tab in the Project Designer, click the View Code button. The logic that updates the Status Panel resides in the SetConnectionStatus method of MainForm. Network events in Visual Basic are marshaled back to the main application thread; handlers of these events can, therefore, manipulate the user interface directly.

See Also