Get default gateway from network key stored in Registry : Registry Network : Windows C# Examples

    
using  System;
using  Microsoft.Win32;

class  MainClass
{
        public  static  void  Main()
        {
            RegistryKey  start  =  Registry.LocalMachine;
            RegistryKey  cardServiceName,  networkKey;
            string  networkcardKey  =  "SOFTWARE\\Microsoft\\Windows  NT\\CurrentVersion\\NetworkCards";
            string  serviceKey  =  "SYSTEM\\CurrentControlSet\\Services\\";
            string  networkcardKeyName,  deviceName,  deviceServiceName,  serviceName;
        
            RegistryKey  serviceNames  =  start.OpenSubKey(networkcardKey);
            if  (serviceNames  ==  null)
            {
                    Console.WriteLine("Bad  registry  key");
                    return;
            }
        
            string[]  networkCards  =  serviceNames.GetSubKeyNames();
            serviceNames.Close();
        
            foreach(string  keyName  in  networkCards)
            {
                    networkcardKeyName  =  networkcardKey  +  "\\"  +  keyName;
                    cardServiceName  =  start.OpenSubKey(networkcardKeyName);
                    if  (cardServiceName  ==  null)
                    {
                        Console.WriteLine("Bad  registry  key:  {0}",  networkcardKeyName);
                        return;
                    }
                    deviceServiceName  =  (string)cardServiceName.GetValue("ServiceName");
                    deviceName  =  (string)cardServiceName.GetValue("Description");

                    serviceName  =  serviceKey  +  deviceServiceName  +  "\\Parameters\\Tcpip";
                    networkKey  =  start.OpenSubKey(serviceName);
                    if  (networkKey  ==  null)
                    {
                        Console.WriteLine("        No  IP  configuration  set");
                        return;
                    }
                    string[]  defaultGateways  =  (string[])networkKey.GetValue("DefaultGateway");

                    foreach(string  defaultGateway  in  defaultGateways)
                    {
                            Console.WriteLine("        Gateway:  {0}",  defaultGateway);
                    }
                    networkKey.Close();
            }
            start.Close();
        }
}