Have you tried anything so far Suneel?
A simple search on google
] with your question gives 306,000 results. Many of those threads will solve your question for sure.
This is one of CP article from same search ASP.NET GridView Image Command Button Problem (Multiple PostBacks)
], you will easily come to know how to add image button if you refer this.
You can also try search on CodeProject stuff
], and get many similar QA & articles.
Try something by your side first then post your question.