I'm using the latest RadGrid with a LinqDataSource and it is amazing the amount of functionality you have built in. I've written no code, and even better, no SQL! Alas, I've run into a slight problem. When the grid is grouped, sorting works perfectly, but when the grid is grouped, has multiple groups, and a filter is applied, sorting doesn't seem to work at all. Also, it seems to only happen when I'm filtering on a number, but I have not confirmed this as yet.