That's really just way too broad a question. The basics of data access are covered in pretty much any beginner C# tutorial you can find online and there are more specific examples of data access about as well. You need to make some sort of effort on your own behalf first. Research, read and attempt to implement. If you run into a specific issue when doing that, then post a question here with the information relevant to that issue. We're more than happy to help with actual issues but we're not here to provide free tutoring.