How Web Parts Work
WSS 3.0 comes packed with a lot of Web Parts that can be used with little configuration. They should meet most of your business requirements, but inevitably at some point you will want to create your own.
In WSS 3.0, the Web Part infrastructure has been radically improved; it is now built entirely on top of ASP.NET 2.0. The WSS 3.0 infrastructure uses the classes from ASP.NET 2.0 as base classes. SharePoint’s WebPart and WebPartManager classes are still there, but they now they inherit from System.Web.UI.WebControl.WebPart and System.Web.UI.WebControls.WebParts.WebPartManager. (This process of changing the base for a class is called rebasing.)
You can build your Web Parts by inheriting them from the ASP.NET 2.0 Web Part or from ...
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