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I'm going through the learning cliff of programming for a 4-series processor with VS2019.? I always try to program my drivers using VS2008 so the code can be run on a 3-Series processor or a 4-Series processor.? In this case I need VS2019's support for WebSockets.

To pass data back to a group of Simpl+ modules I would do the following with VS2008:

??? public class SerialChangeEventArgs : EventArgs
??? {
??????? public string entity_id { get; set; }

??????? public SerialChangeEventArgs()
??????? {
??????? }

??????? public SerialChangeEventArgs(string entity_id)
??????? {
??????????? this.entity_id = entity_id;
??????? }
??? }

??? public static class SignalChangeEvents
??? {
??????? public static event SerialChangedEventHandler onSerialValueChange;

??????? public static void SerialValueChange(string entity_id)
??????? {
??????????? SignalChangeEvents.onSerialValueChange(new SerialChangeEventArgs(entity_id));
??????? }
??? }

However, under VS2019 I get the following error:

Error??? CS0246??? The type or namespace name 'SerialChangedEventHandler' could not be found (are you missing a using directive or an assembly reference?)

I have the same "using" directives that I have used with VS2008.

Any assistance would be greatly appreciated.

Thanks

Jay