Sharepoint eventhandler itemupdating

There is no exception thrown if we first update item2 and then item1.

It doesn’t happen if we read a value from item1 rather than item2 and it doesn’t happen if we don’t read any value at all.

There are four ways to uppdate a list item through the object model.

All of them call the internal method Update Internal() which has some interesting arguments like The experiment showed that all of them but one were leading to an exception being thrown. So one way to fix the problem is changing your event receiver to update the list item using System Update(false).

To resolve this error always remember to create a new fresh SPSite object to retrieve the list and the file objects from, in the same method where you are doing the update.

This helps big time and solves 90% of the causes of this error I’ve seen.

For example, you can subscribe to the "Item Added" event for a specific list, and have your custom code execute when the event fires.This is a very legitimate and good example of when using a “goto” statement in your code is actually good.If you don’t agree with me about the “goto” statement then look at this different but similar problem caused by race conditions and how it is solved using a try-catch-goto block in this Microsoft article: if you are getting the error in your own code it is due to an SPSite created in a completely different branch of the solution and then SPWebs or SPLists are being passed as arguments down to your function where you try to update the list item. Then I isolates the cause and reworked the code so the exception is thrown even from a single thread. Add Or Update Item(String bstr Url, String bstr List Name, Boolean b Add, Boolean b System Update, Boolean b Preserve Item Version, Boolean b Update No Version, Int32& pl ID, String& pbstr Guid, Guid pbstr New Doc Id, Boolean b Has New Doc Id, String bstr Version, Object& pvar Attachment Names, Object& pvar Attachment Contents, Object& pvar Properties, Boolean b Check Out, Boolean b Checkin, Boolean b Migration, Boolean b Publish String bstr Url, String bstr List Name, Boolean b Add, Boolean b System Update, Boolean b Preserve Item Version, Boolean b Update No Version, Int32& pl ID, String& pbstr Guid, Guid pbstr New Doc Id, Boolean b Has New Doc Id, String bstr Version, Object& pvar Attachment Names, Object& pvar Attachment Contents, Object& pvar Properties, Boolean b Check Out, Boolean b Checkin, Boolean b Migration, Boolean b Publish String bstr Url, String bstr List Name, Boolean b Add, Boolean b System Update, Boolean b Preserve Item Version, Boolean b Update No Version, Int32& pl ID, String& pbstr Guid, Guid pbstr New Doc Id, Boolean b Has New Doc Id, String bstr Version, Object& pvar Attachment Names, Object& pvar Attachment Contents, Object& pvar Properties, Boolean b Check Out, Boolean b Checkin, Boolean b Migration, Boolean b Publish Boolean b Add, Boolean b System, Boolean b Preserve Item Version, Boolean b No Version, Boolean b Migration, Boolean b Publish, Boolean b Check Out, Boolean b Checkin, Guid new Guid On Add, Int32& ul ID, Object& obj Attachment Names, Object& obj Attachment Contents, Boolean suppress After Events) 3215 I spent some time writing test code to try and reproduce the problem when multiple threads are doing updates to the same file and I finally managed to get the error.

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