This article explains how easy it is to create an online address book using asp.net. Online address book can either be used in your website or a personal address book for your visitors. Whatever the purpose, once you learn the basics on how this works, creating other ASP.NET applications will be a lot easier as most ASP.NET applications fall in the same concept. The article covers everything with included source code. I advise that you read the source thoroughly, not just copy and paste the source in your project so you’ll know what exactly is happening in the program and what you can do in case something went wrong.