It seems this particular approach does not work any more with latest versions of RadGrid. We want to apologize for the omission to update the help topic to show a working approach. We will do that on first available occasion. As a token of gratitude for letting us know and contributing to the improvement of our products, I have updated your Telerik points with additional 500.
Currently, there is no server-side-only approach for persisting client-side selection with disabled ViewState. You need to collect the selected indexes from the client and persist them in a hidden field. For your reference, I have prepared a test page. It demonstrates how the grid selected indexes are collected and saved in an external hidden field. Back on the server, the hidden field value is parsed and the selection is restored to the respective items. Let me know how this works for you.
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