VpnStatus

Windows Forms app with a system tray icon indicating VPN connection status:

Configure which VPN is monitored and how often network connections are polled:

<appSettings>
  <!-- the name of your VPN connection in Control Panel's Network Connections -->
  <add key="VpnName" value="your.vpn.name" />

  <!-- how often to query network connections to check vpn status -->
  <add key="IntervalToPollMs" value="3000" />
</appSettings>

How do I run this?

Get the code
Update App.config's VpnName to match yours
Build the project in VS2015+
Run the output, VpnStatus.exe