Engine Exceptions

public enum EAErrorCode
{
  Unknown, // An unknown error has occured, not able to categorize it.
  DeviceIsBusy, // The device is busy.
  UnknownEAManagementType, // An unknown External Accessory Management type selected
  ConnectionTimeout, // The connection timed out before or after inital connection was made
  ConnectionInterupted, // Connection lost after initial connection was made or when request has been sent to device and no response has been received 
  FailedToConnect, // There is no connection and there was no initial connection made, can also happen when request is sent
  DevicePairingNeeded, // A pairing function is needed before this action
  PairingError, // An error occured in the pairing process
  PairingCodeMismatch, // A mismach between pairing codes
  BatteryTooLow, // The battery is too low on the device, action not possible at this moment
  SessionInProgress, // A session is already in progress
  ConfigurationError, // Configuration error
  CommuncationFailure, // Failed to send or receive a response from the PED
  CouldNotParseData, // Could not parse data from the PED
  NotSupported, // Action or process not supported
  MissingInformation, // Missing settings or any other information the device needs
  CouldNotConnectWithHostThroughTerminal, // Could not connect with host through terminal
  DLLMissing, // Could not load DLL
}

public enum EFTErrorCode
{
  Unknown, // An unknown error occured, not able to categorize
  RequestArgumentError, // An argument exception is thrown
  NoSession, // No session is active.
  FailureToStartSession, // Failed to start a session
  FailureToFinishSession, // Failed to finish a session
  TransactionNotFound, // Transaction cannot be found
  UnsupportedOperation, // Operation is not supported
  CorruptedDataReceived, // Service has received corrupted data
  UnexpectedResultReceived, // An unexpected result value was received in the response.
  NotSupported, // Not supported request sent in
  DataMissing, // Data missing that was expected
  UnexpectedDataReceived, // Data received is not what was expected
  Timeout, // Timeout while waiting for customer
  InvalidOperation, // Transaction already in progress
}

public enum BRErrorCode
{
  Denied, // Barcode connection denied
  PowerOnFailure, // Could not power on the barcode reader
  Cancelled, // Action cancelled
  Unknown // An known error occured, not able to categorize 
}

public enum LineItemErrorCode
{
  Unknown, // An unknown error occured, not able to categorize
  NoData, // No data was received
  Mismatch, // Mismatch in data given
  InvalidCobination, // Invalid combination 
  FieldRequired, // Field required
  InvalidField, // Invalid field or decoding failed
  Exists, // Line item already exists
  NotExists, // Line item does not exist
  InvalidValue, // Not valid value for field
  CannotBeNegative, // Field value cannot be negative
  MustBeGreaterThan // Field value must be greater than 0
}

public enum ParamName
{
  CurrencyCode, 
  AmountBreakdown,
  TotalAmount,
  CashbackAmount,
  TipAmount,
  TransactionType,
  TransactionId,
  EFTTransactionId,
  AdditionalId,
  Other,
  Surcharge,
}

try
{
  updateResult = settings.UpdateValue(setting.Key, editBox.Text);
}
catch (ArgumentException ae)
{
  using (var builder = new AlertDialog.Builder(this))
  {
    builder.SetMessage(ae.Message);
    builder.SetPositiveButton("OK", (s, a) => { });
    var myCustomDialog = builder.Create();
    myCustomDialog.Show();
  }
}

public enum SettingErrorCode
{
  InvalidKey, // An invalid key was sent in, not recognised
  DataTypeMismatch, // Wrong type of data received
  ReadOnly, // Value is read only, not possible to alter
  Unknown,
}