I am trying to show features returned from query on map as selection so that this selection set can be exported. I am able to get the featureSet and show all object ids in a table. And now I want that when an item is selected in the table it should get selected on map as feature selection.
If I understand your question, in Arcmap if a user makes a selection in an attribute table you want the selection to highlight the features on the map? If I am correct then have a look at the ITableWindow Interface.
Also have a look at the ITableSelection interface?