>I have a collection. I add them using a unique identifier. However, before adding a new one, I verify something. If that is the case, I remove the related item from the collection, by using its key, update something in its content, and insert the item back into the collection by using the same key.
>
>So, it goes like this:
>
>

>' Get the item from the collection
>loObject = oInnerJoin.Item(lnKey)
>
>' Remove the item from the collection
>oInnerJoin.Remove(lnKey)
>
>' Set the search criteria to True
>loObject(1) = True
>
>' Add the updated item in the collection
>oInnerJoin.Add(loObject, lnKey, 1)
>

>
>So, in a specific logic, this is executed three times on the same key. The first two times, it works. I see the collection item being removed and added back with the object loObject(1) item. However, on the third time, it gives this:
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>"Add failed. Duplicate key value supplied."
>
>Anyone would be able to explain that?

I cannot explain it, I cannot even understand the code, is loObject an array? (you have loObject(1) = True)

Anyways, if you are storing an object as the name of the variable suggests, you should not need to update the collection, what is stored in the collection is the pointer to the object, so when you modify it the collection should have the new value, for example in FoxPro (Should be the same in VB or any other OO language):

lcKey			= 'myLine'
loInnerJoin		= CREATEOBJECT('Collection')
loObject		= CREATEOBJECT('Line')
loObject.Left	= -11

loInnerJoin.Add(loObject, lcKey)				&& Add the object to the collection

loObject		= loInnerJoin.Item(lcKey)		&& Get the object from the collection
? 'Initial value:', loObject.Left	&& -11 as it was the value I assigned first

loObject.Left	= 22				&& Change the value of the property

loObject		= loInnerJoin.Item(lcKey)		&& Get the object from the collection again
? 'Updated value', loObject.Left	&& -22 as the object is the one that has been changed