I guess you are binding the grid using simple data binding. Please make sure that your RadGrid must be bound using declarative data sources
or through the NeedDataSource event
. When using declarative data sources or the NeedDataSource event, RadGrid can automatically accommodate the appropriate database operations without the need for you explicitly handle any sorting, paging, grouping, and so on. When you have complex operation like Inserting, deleting, and updating records ,Grouping, Hierarchy relations, Filtering, Sorting and Paging
these methods are recommended. Please try and let me know if any concern.