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Hi Usman,
It is recommended to utilize the server operations when the data that you are working with is rather large. This is due to the fact that the modifications of large sets on the client-side are rather slow.
Another disadvantage of the client-side operations is that the data source would retrieve all the items from the database with the very first request. This might put unnecessary traffic load, especially if the whole data set is not needed.
On the contrary, you would be able to make any modifications to the data set on the client-side because all of the items would be available (including the ones that are not on the current page). For instance, if the server operations are set, you would have access only to the items on the current page.
If you share more details on the scenario that you are willing to achieve, I would have the opportunity to provide clear-cut suggestions targeting your specific business needs.
Best regards,
Tsvetomir
Progress Telerik