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SPItemEventReceiver, properties.Cancel not working

Posted By:      Posted Date: October 25, 2010    Points: 0   Category :SharePoint

I'm attempting to do some custom validation (which should be REALLY easy, but apparently is not).  I cannot use a column-level validation since I need to reference mulitple columns and I cannot do the List-level validation since I need to do multiple tests and the validation for the entire List only handles one test.

So I thought I'd try to capture the "ing" events for the list (Adding, Updating) and see if the old aspx standby of "e.cancel", etc. would work.  From what I found it should, sort of.  I've seen blogs that say I can do the following (My actual code):

      public override void ItemUpdating(SPItemEventProperties properties)

           DateTime sd = Convert.ToDateTime(properties.AfterProperties["StartDate"].ToString());
           DateTime ed = Convert.ToDateTime(properties.AfterProperties["_EndDate"].ToString());

           if (sd.Date >= ed.Date)

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