Hey Gayan! Never do that. Sitting too long in front of a PC can cause a severe back-pain problem. There will be swelling in the lower back area, and any sudden movement can cause the lower discs to bend or slip. Make sure you don't sit too long, get up, do a few stretches, walk for some time and drink a lot of water. Walking helps. Go for both evening and morning walks. I hope you feel better soon.