BugTracker.NET is a free, open-source, web-based bug tracker or customer support issue tracker written using ASP.NET, C#, and Microsoft SQL Server (or its free cousin, SQL Server Express). It is in daily use by thousands of development and customer support teams around the world.
BugTracker.NET is easy to install and learn how to use. When you first install it, it is very simple and you can start using it right away. Later, you can change its configuration to handle your needs if they are more complex.