Override values of Created By and Modified By fields

In some cases, it could be useful (or maybe even necessary) to be able to override the values in a SPListItem's Created By (Author as Internal Name) and Modified By (Editor as Internal Name).

So, how can you accomplish this? Simple!

web.AllowUnsafeUpdates = true;

item["Editor"] = string.Format("{0};#{1}", spUser.ID, spUser.Name);
item["Author"] = string.Format("{0};#{1}", spUser.ID, spUser.Name);

item.UpdateOverwriteVersion();

web.AllowUnsafeUpdates = false;

The key is item.UpdateOverwriteVersion(). item.Update() and item.SystemUpdate() won't work here. Created By and Modified By are read-only fields and aren't meant to be messed with. However, I have been in situations where I had to modify them using code.

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Horns up \m/