Hi Joyanta,
Thank you for your feedback.
The only way to prevent a column being exported now is to hide it in the grid view control itself. However we have plans to provide the functionality to choose the columns for export/print in future versions but for now it is only possible to prevent a column from being exported is to right clicking on the column's header and click 'Hide'.
If you have any other questions do not hesitate to contact us.
Sincerely Yours
Support Team