How to get IPv4 and IPv6 address of local machine?

.net, c#, windows

Solution

string strHostName = System.Net.Dns.GetHostName();;
IPHostEntry ipEntry = System.Net.Dns.GetHostEntry(strHostName);
IPAddress[] addr = ipEntry.AddressList;
Console.WriteLine(addr[addr.Length-1].ToString());
if (addr[0].AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
            {
                Console.WriteLine(addr[0].ToString()); //ipv6
            }

Problem

I am developing a windows application and I need to find the IPv4 and IPv6 address of local machine. OS can be XP or Windows 7. I got a solution for getting MAC address like, ``` string GetMACAddress() { var macAddr = ( from nic in NetworkInterface.GetAllNetworkInterfaces() where nic.OperationalStatus == OperationalStatus.Up select nic.GetPhysicalAddress().ToString() ).FirstOrDefault(); return macAddr.ToString(); } ``` This is working in all OS. What is the correct way to get IPv4 and IPv6 address that work on XP and WINDOWS 7?

Original source