I was able to replicate the described exception, which is thrown using the demonstrated implementation. I had forwarded it to our developer team for further consideration. However, I am afraid that the scenario you had implemented is not valid. When you are using the Server ItemTemplcate, an AutoPostBackOnReorder
should be set to true
, in order to ensure the correct reorder of the Items. You could encapsulate the RadListBox in an
, like demonstrated in this online demo
Another possible approach is to use the ClientItemTemplate
, where AutoPostBackOnReorder
does not need to be set. I have prepared a sample page for you, demonstrating a possible implementation, using the ClientItemTemplate. Please find it attached.
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