Here are some ASP.NET Web Forms samples recommended by the ASP.NET team. You can find more samples on the MSDN Samples Gallery.
BlogEngine.NET is very easy to setup and customize. To make it work, just upload the files to an ASP.NET 4.0 webserver and you’re ready to start writing. No database configuration, just plug ‘n play.
ScrewTurn Wiki allows you to create, manage and share wikis. A wiki is a collaboratively-edited, information-centered website: the most famous is Wikipedia. ScrewTurn Wiki is based on Microsoft ASP.NET 3.5 and runs on Windows Server 2003 or Windows Server 2008.
Subtext is a blog engine that focuses on usability, elegance, and simplicity. If you've ever caught yourself throwing your hands in the air and declaring that you're going to write your own blogging engine, then Subtext is for you.
Tailspin Spyworks demonstrates how extraordinarily simple it is to create powerful, scalable applications for the .NET platform. It shows off how to use the great new features in ASP.NET 4 to build an online store, including shopping, checkout, and administration.
DotShoppingCart is a complete CMS (Content Management System) and ecommerce open source solution.
The project illustrates how to design a simple AJAX web chat application. It uses jQuery, ASP.NET AJAX, and Linq to SQL.
Employee Starter Kit is intended to address different types of real world challenges faced by web application developers when performing common CRUD operations. Using a single database table "Employee", the current release illustrates how to utilize Microsoft ASP.NET 4 Web Form Data Controls, Entity Framework 4, and Visual Studio 2010 effectively in that context.
A Visual Studio project which shows how to use the Entity Framework in an ASP.NET Web Forms web application project, using the Database First workflow and the ObjectDataSource control and EntityDataSourceControl.
The project illustrates how to use the Chart control to create a chart in a web page.
Find more ASP.NET samples on the MSDN Samples Gallery! Have a sample to share with the community? You can upload it here.