private static bool IsRegistryExist() { RegistryKey key = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\InfofixPosBilling"); //if it does exist, retrieve the stored values if (key != null) { EncryptionDecryption encryption = new EncryptionDecryption(); registryValue = Convert.ToDateTime(encryption.Decryptdata(key.GetValue("ExpiryDate").ToString())); key.Close(); return(true); } else { return(false); } }