how to add the item into eventData

[DarioCrivelli]

The IItemEventListener.Update method specifications require that only String objects or byte arrays can be used as field values. You have to perform the conversions from numbers to strings in Data Adapter code, before populating the IDictionary object.
(We might think about improving the error message.)
Dario

[tuongkha]

Thanks Dario. I convert from numbers to strings, it's ok.

public IDictionary GetCurrentValues(bool fullData) {
lock (this) {
IDictionary eventData = new Hashtable();
...
eventData["ceiling"] = _ceiling.ToString();
eventData["floor"] = _floor.ToString();
}
}

[DarioCrivelli]

The remaining part of the thread has been moved as
/vb/showthread.php?t=238