Example in c#

using System;

using System.Security.Permissions;

using Microsoft.Win32;

 

class RegKey

{

    static void Main()

    {

        // Create a subkey named Testkey under HKEY_CURRENT_USER.

        RegistryKey testkey =

            Registry.CurrentUser.CreateSubKey("Testkey");

        // Create two subkeys under HKEY_CURRENT_USER\Testkey. The

        // keys are disposed when execution exits the using statement.

        using(RegistryKey

            testName = testkey.CreateSubKey("TestName"),

            testSettings = testkey.CreateSubKey("TestSettings"))

        {

            // Create data for the TestSettings subkey.

            testSettings.SetValue("Language", "Hindi");

            testSettings.SetValue("Level", "Class");

            testSettings.SetValue("ID", 1);

        }

 

        // Print the information from the Testkey subkey.

        Console.WriteLine("There are {0} subkeys under {1}.",

            testkey.SubKeyCount.ToString(), testkey.Name);

        foreach(string subKeyName in testkey.GetSubKeyNames())

        {

            using(RegistryKey

                tempKey = testkey.OpenSubKey(subKeyName))

            {

                Console.WriteLine("\nThere are {0} values for {1}.",

                    tempKey.ValueCount.ToString(), tempKey.Name);

                foreach(string valueName in tempKey.GetValueNames())

                {

                    Console.WriteLine("{0,-8}: {1}", valueName,

                        tempKey.GetValue(valueName).ToString());

                }

            }

        }

 

        using(RegistryKey

            testSettings = testkey.OpenSubKey("TestSettings", true))

        {

            // Delete the ID value.

            testSettings.DeleteValue("id");

 

            // Verify the deletion.

            Console.WriteLine((string)testSettings.GetValue(

                "id", "ID not found."));

        }

 

        // Delete or close the new subkey.

        Console.Write("\nDelete newly created registry key? (Y/N) ");

        if(Char.ToUpper(Convert.ToChar(Console.Read())) == 'Y')

        {

            Registry.CurrentUser.DeleteSubKeyTree("Testkey");

            Console.WriteLine("\nRegistry key {0} deleted.",

                testkey.Name);

        }

        else

        {

            Console.WriteLine("\nRegistry key {0} closed.",

                testkey.ToString());

            key.Close();

        }

    }

}