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Disable event firing before you Update your item. this.EventFiringEnabled = false; item.Update(); this.EventFiringEnabled = true; Note that this might cause problems when item.Update() throws an exception, leaving your eventfiring off.. you can use a try/catch to solve this. hope I could help : )

I have not personally run into this issue but it sounds a lot like an unsafe update error. Assuming properties.ListItem is a reference to the newly moved file and not null or somehow have a reference to the old file location, you can try something like this: movedFile.Web.AllowUnsafeUpdates = true; movedFile.Update(); movedFile.Web.AllowUnsafeUpdates = ...

What about checking out file before modifying properties? You check if file is available: if true, you check out file, do changes and check it back in. if file is already checked out you just wait (random amount of time) and then get file status again - after this you have available file or wait again. There is no need to modify the file, but you can use ...