Prob in Finding IPAddress, Default gate way,Subnet mask

using System;
using System.Net.NetworkInformation;

public class blahblah
{
  public static void Main()
  {
    NetworkInterface[] Interfaces = NetworkInterface.GetAllNetworkInterfaces();
    foreach(NetworkInterface Interface in Interfaces)
    {
      if(Interface.NetworkInterfaceType == NetworkInterfaceType.Loopback) continue;
      Console.WriteLine(Interface.Description);
      UnicastIPAddressInformationCollection UnicastIPInfoCol = Interface.GetIPProperties().UnicastAddresses;
      foreach(UnicastIPAddressInformation UnicatIPInfo in UnicastIPInfoCol)
      {
        Console.WriteLine("\tIP Address is {0}", UnicatIPInfo.Address);
        Console.WriteLine("\tSubnet Mask is {0}", UnicatIPInfo.IPv4Mask);
      }
    }
  }
}

public void PrintDefaultGateway() 
{ 
   var defaultGateway = 
   from nics in NetworkInterface.GetAllNetworkInterfaces() 
   from props in nics.GetIPProperties().GatewayAddresses 
   where nics.OperationalStatus == OperationalStatus.Up 
   select props.Address.ToString(); 

   Console.WriteLine("\tGateway is {0}", defaultGateway.First());
}