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Outlook._NameSpace oNameSpace;

Posted on 2004-04-13
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Last Modified: 2010-04-15
What is the difference between

Outlook._NameSpace oNameSpace;

and

Outlook.NameSpace oNameSpace;



both are available via "code completion" in C# when I type Outlook.
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Question by:Tom Knowlton
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vascov earned 2000 total points
ID: 10822789
Actually that's a COM "legacy" :)

In COM, the Namespace is a coclass that implements the interface _Namespace (plus a dispinterface NameSpaceEvents). (You'll actually notice that in managed code NameSpace itself implements _NameSpace and also the Events interface.
In COM the interface was prefixed with _ as a convention so that in VB6 it wasn't intellisensed. (VB6 hiddes interfaces prefixed with _)

When you import the COM typelib to .NET, it imports everything including that interface.

You should get by using Namespace, _Namespace or NameSpaceClass without problems.

hth

Vasco
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by:Tom Knowlton
ID: 10824224
Thank you,

Tom
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by:Tom Knowlton
ID: 10825064
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by:Tom Knowlton
ID: 11120009
UPDATE:

Well, guess what?

I finally had a major breakthrough on this @!#$^% problem that has been driving me crazy for the last few weeks!!!!!!!


It is a very small change.

Apparently the method   MoveFirst(   ) does not work so well with Exchange.

This was the cause of my COMException:   "Interface not registered" error message this entire time.


The solution is to use    Move(1,0)     instead of MoveFirst(  ).


That's it.   Simple.

This answer came courtesy of Tom Rizzo, an author who was kind enough to correspond with me and help me figure-out finally what the problem was.:

Looking for a good book on programming Exchange, Outlook, ADSI and
SharePoint?  Check out http://www.microsoft.com/MSPress/books/5517.asp

My I also reommend:

.NET and COM: The Complete Interoperability Guide  ISBN:067232170X
http://www.amazon.ca/exec/obidos/ASIN/067232170X/componentsnot-20/701-9386310-4703553
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by:Tom Knowlton
ID: 11120305
More on the MoveFirst problem I described:

http://support.microsoft.com/default.aspx?scid=kb;en-us;273791


If you are getting into Event Sinks....I recommend the following tutorial:

http://www.codeproject.com/csharp/CsManagedEventSinksHooks.asp

Make sure and read the article questions and follow-ups at the bottom!

There are a few caveats.  E-mail me at my Profile e-mail address and we can talk about them.  :)
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