namespace which is requried in remove oracle9i in registry

string keyName = @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run";//Path of Key,You can specify full path
using (RegistryKey key = Registry.CurrentUser.OpenSubKey(keyName, true))
{
    if (key == null)
    {
        // Key doesn't exist. Do whatever you want to handle
        // this case
    }
    else
    {
        key.DeleteValue("Value");
    }
}