Read Registry using C#

This is the code that I use:

For lookup:

RegistryKey rkn  = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Test");
dwResult = rkn.GetValue("Preferences");

For update:

RegistryKey rkn  = Registry.LocalMachine.CreateSubKey(szKeyPath);             
dwResult = rkn.ValueCount;
rkn.SetValue(szKey, szValue);

For insert:

RegistryKey rkn = Registry.LocalMachine.CreateSubKey("Software\\Test");
rkn.SetValue("Preferences1", "xxxx");

I hope that helps.