If you look at a SharePoint application you'll find that most of its active components are Web Parts. SharePoint 2010 includes dozens of prebuilt Web Parts that you can use. It also provides an API that lets you build custom Web Parts using C# or VB.NET. SharePoint 2010 Web Parts in Action is a comprehensive guide to deploying, customizing, and creating Web Parts. Countless examples walk you through everything from design, to development, deployment, troubleshooting, and upgrading.