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Reading Calendar information from Exchange 2007 using Exchange Web Services and ASP.Net

Posted on 2010-08-26
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Last Modified: 2012-05-10
I'm trying to read Exchange 2007 calendar appointment information using ASP.Net and EWS.

Initially, I'm trying to read my calendar which resides on my company's network to which I can VPN.

EWS is set up properly as far as I can tell.  I've set up the Web Reference and the Exchange Service Binding.  It seems to go to my company's server with no problems.

Using examples from the web (this one in particular - http://msdn.microsoft.com/en-us/library/bb408521.aspx -which writes an item to the Sent Items folder on email and works) I'm trying to figure out how to do this.  As I say, the example shown by this URL works.  However, when I try to use an example to read from my calendar, the whole thing fails and I can't figure out why.

The code example at the bottom of this URL (http://msdn.microsoft.com/en-us/library/exchangewebservices.finditemtype(EXCHG.80).aspx) fails at line 118 which reads:

object obj = fipt.Item;

The error written to the console is "Object reference not set to an instance of an object".  Interrogating "responsemessage" on line 114 shows a messagetext of "The specified value is invalid for property."

Can ANYONE help me with this or show me the way to do this properly from scratch?

I've TRAWLED the internet and Microsoft's site, but cannot find anything which helps.

Thanks,

Tony
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Question by:capnross
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by:Robberbaron (robr)
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not worked with appointments at all myself but have been trying out  notifications and there is a long article with full code by an Exchange  MVP that monitors users calendars.  Ive run the example and it does work, though I was just using it for learning.

http://exchangenotification.codeplex.com/
http://www.infinitec.de/category/Exchange-articles.aspx
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by:capnross
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Thanks for that, but it's not really what I'm after.  I can actively now push things into my calendar using EWS, but it's still not clear how to read/parse the calendar data.
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Robberbaron (robr) earned 500 total points
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ignoring the notifications focus, one of those examples reads a number of user calendars  and displays results within the c# app.
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Author Closing Comment

by:capnross
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Thanks for your help RobberBaron, I got there in the end.
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