How can we programatically detect whether the sytem is on LAN or dial up in Windows7 in vb.net

We have a situation wherein we need maximum uptime for database connectivity which is on our LAN. However, we would like to connect to the server also in the event that the LAN is down. We have option of doing this [switch to dial-up from LAN] automatically using code or manually an operator can do so. The problem is to determine if the current connection is whether on a LAN or Dial-up? We are using: Windows 7 / VB.net 2.0. TIA, -Vikas

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