Thank you for writing.
The changes in your project that you need to apply depend on the controls used. In Q2 2010 we introduced an improved RadGridView control implementing many optimizations and new features in it. These improvements were accompanied by some breaking changes that we could not avoid. You can see a list of the breaking changes in our Release Notes
I would also like to mention that at the beginning of November we are planning to release the Q3 2010 version of our controls where even more improvements and additions will be introduced. So, I would recommend, if possible, to wait for the new release and perform an upgrade directly to the Q3 version.
When you decide to upgrade, please refer to the following help article which concerns the general steps that you need to follow while upgrading your project to the new Telerik version: Application Upgrade
I hope you find this information helpful. Should you need any further assistance during the transition process, do not hesitate to contact me.
All the best,
the Telerik team
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