private void GetUsageData()
{
// get the previous usage count
//
RegistryKey usageKey = _baseKey.OpenSubKey(_usageKeyName, true);
string countString = Decrypt((byte[])usageKey.GetValue(null));
_usageCount = int.Parse(countString);
// increment the usage count
//
_usageCount++;
usageKey.SetValue(null, Encrypt(_usageCount.ToString()));
usageKey.Close();
}