public static bool IsInSameAddressFamily(IPAddress firstAddress, IPAddress secondAddress)
{
return((RuntimePlatformUtils.IPAddressIsValidIPv4(firstAddress.ToString()) && RuntimePlatformUtils.IPAddressIsValidIPv4(secondAddress.ToString())) ||
(RuntimePlatformUtils.IPAddressIsValidIPv6(firstAddress.ToString()) && RuntimePlatformUtils.IPAddressIsValidIPv6(secondAddress.ToString())));
}