Hi Anantharaman,
With a regular dataset for the datasource it means that the sort command have to be executed on the server because the actual data that is bound to the grid is in a dataset structure on the server. So a postback is required in this case when you use server-side binding to a regular dataset.
Another option is to try to utilize a client-side binding if it is applicable in your scenario. Detailed demo of it (including sorting) can be found here:
http://demos.telerik.com/aspnet-ajax/grid/examples/client/declarativedatabinding/defaultcs.aspx
Greetings,
Marin
the Telerik team
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