Question

DeviceNetworkInformation.IsNetworkAvailable

    // Summary:
    //     Gets a value that indicates whether the network is available.
    //
    // Returns:
    //     true if there is at least one network interface available; otherwise, false.
    public static bool IsNetworkAvailable { get; }

NetworkInterface.GetIsNetworkAvailable()

    // Summary:
    //     Indicates whether any network connection is available.
    //
    // Returns:
    //     true if a network connection is available; otherwise, false.
    [SecuritySafeCritical]
    public static bool GetIsNetworkAvailable();

Are these identical?

Answer 1

Microsoft wants you to use DeviceNetworkInformation.IsNetworkAvailable

NetworkInterface is in System.Net where as DeviceNetworkInformation is in Microsoft.Phone.Net.NetworkInformation.

The DeviceNetworkInformation.IsNetworkAvailable might map to NetworkInterface.GetIsNetworkAvailable() internally, but you should always use DeviceNetworkInformation.IsNetworkAvailable because it’s made for the phone (and have a cleaner API).

And as pointed out by Matthieu, DeviceNetworkInformation.IsNetworkAvailable is apparently new in 7.1 (Mango).