I know it is not the exact answer you are looking for but if I need to use a fixed IP I get my netduino to run this line at the when it boots up.
Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].EnableStaticIP("192.168.1.122", "255.255.255.0", "192.168.1.62");
by using this I don't need to configure each device before using I just change the IP I want to change.