We have a heavy traffic data in DB, we don't want to dump huge data on to the client side and do grouping and aggregating.
So I started doing it on server side pagination, grouping and stuck with one column grouping. Need help with support multiple column grouping and then also able to aggregate data on server side.
Here is my grid Read Method
Here is my Grouping Method
As you can notice currently I am only able to group with the first group member, how can I support multiple column grouping?