Have you actually done any WinForms programming? Have you used the DataGirdView?

The DataGirdView "Allow(s) the user to sort (ascending/descending) by clicking on the column header. Provide(ing) a visual clue as to how the sorting is done in the column header. (It) Do(es) this without round tripping to the server".

Do you know what "disconnected data access" means?

Do you undestand that you can sort datatables / dataviews? (without "round tripping").

>Let me clarify...
>
>Allow the user to sort (ascending/descending) by clicking on the column header. Provide a visual clue as to how the sorting is done in the column header. Do this without round tripping to the server.
>
>Now do the same thing, but with grouping and provide an indicator in the grid where one group ends and another begins.
>
>
>>SELECT * FROM MyTable ORDER BY... GROUP BY
>>
>>How did you do this without WPF? I've done it a few different ways. Surely you're not advocating that there was no way to do this before WPF?