public void SubscribeInformation(STATIONNAME StationName, DEVICENAME DeviceName, dynamic FieldName)
{
ServerCallBack ClientCallBack = OperationContext.Current.GetCallbackChannel <ServerCallBack>();
OperationContext Context = OperationContext.Current;
AstroData.SubscribeInformation(StationName, DeviceName, FieldName, Context.SessionId, ClientCallBack);
}