Hi Sathish,
I have created a sample as per your specification. The sample illustrates the possiblity to change the color of the cell when the cell text is changed. Please refer to the attached sample and let me know if you are trying something different.
Here is a sample.
http://www.syncfusion.com/Support/user/uploads/GridColorChanges_607b4fad.zipLet me know if this helps.
Best Regards,
Haneef