Wiring an Outlook Event to a C# app

[Plumer]

A warm, south pacific good morning to everyone

I posted this message on one of the other MSDN newsgroups (Messaging & Collaboration) and realised later that perhaps it wasn't the best choice. If I have transgressed a protocol which specifies posting to one newsgroup only then I can but offer my apologies. That said I still have the event wiring problem summarised below

I am developing a C# app that interfaces with Oulook. I need to be able to recognise when a PropertyChange event occurs in Outlook. I have attempted (unsuccessfully) to wire this up using the following code

//--------------------------------------------------------------------
private void ChangeInOutlook(string s

Console.WriteLine( "Property '{0}' has changed in an Outlook Item", s )

//--------------------------------------------------------------------
public void FiddlingAroundWithOutlook(

//_Item is declared at class scope with: private Outlook.ContactItem _Item
_Item = (ContactItem)_Contacts.Items.Item(1)
_Item.PropertyChange += new Outlook.ItemEvents_10_PropertyChangeEventHandler( ChangeInOutlook )
This compiles without any problems but on execution produces this error message

An unhandled exception of type 'System.InvalidCastException' occurred in interop.outlook.dl
Additional information: No such interface supporte

Just in case you may be wondering, ...Items.Item(1) returns a valid ContactItem
Can anyone give me a steer please on what I'm doing wrong here

Many thank
Plume