Hi puradchi,
Though I believe you have already found your answer in another thread, I would like to respond to you for the sake of completeness.
If you are trying to set your resolution for the CVS, the resolution of the VGA output on the CVS can be modified using the remote target options in Vision Builder for Automated Inspection.
If in fact you are trying to change these settings programatically, there is a VI "IMAQ Video out display mode" which will set the resolution of the CVS. You should be able to do this from LabVIEW with no problems. This VI is included within the Labview RT VIs.
Hope this helps!
Robert
Applications Engineering
National Instruments