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Get Registry value

/* C# Network Programming  by Richard Blum Publisher: Sybex  ISBN: 0782141765 */ using System; using Microsoft.Win32; public class CardGrab {     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");         Console.WriteLine("\nNetwork card: {0}", deviceName);                  serviceName = serviceKey + deviceServiceName +              "\\Parameters\\Tcpip";         networkKey = start.OpenSubKey(serviceName);         if (networkKey == null)         {         Console.WriteLine("    No IP configuration set");         } else         {         string[] ipaddresses = (string[])networkKey.GetValue("IPAddress");         string[] defaultGateways = (string[])networkKey.GetValue("DefaultGateway");         string[] subnetmasks = (string[])networkKey.GetValue("SubnetMask");         foreach(string ipaddress in ipaddresses)         {             Console.WriteLine("    IP Address: {0}", ipaddress);         }         foreach(string subnetmask in subnetmasks)         {             Console.WriteLine("    Subnet Mask: {0}", subnetmask);         }         foreach(string defaultGateway in defaultGateways)         {             Console.WriteLine("    Gateway: {0}", defaultGateway);         }         networkKey.Close();         }     }     start.Close();     } }