Some, but not, all the information provided by the P/Invoke are available from the managed System.Net.NetworkInformation.NetworkInterface (http://msdn.microsoft.com/en-us/library/system.net.networkinformation.networkinterface.aspx) class.

In .NET 2.0, this library (The IP Helper API) is encapsulated in the NetworkInformation namespace.

When you do not need the PID information look at: IPGlobalProperties.GetActiveTcpListeners Method from the System.Net.NetworkInformation namespace

(Msdn: http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ipglobalproperties.getactivetcplisteners.aspx)

System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

Use [System.Net.NetworkInformation.IPGlobalProperties].GetIPGlobalProperties().

Try NetworkInterface.GetIsNetworkAvailable() in the the System.Net.NetworkInformation namespace. It returns true when a network is available and false otherwise. See also: http://msdn2.microsoft.com/en-us/library/system.net.networkinformation.networkinterface.getisnetworkavailable(VS.80).aspx. NOTE: this is all new in .NET 2.0!