The DotNetSlackers site has a nice series of articles about design patterns. The articles were written by Granville Barnett and are a very good read. Here is what is in the first four articles.
Learn how to design more robust and maintainable code by incorporating design patterns into your software projects.
1 Introduction
2 The strategy pattern
3 Implementing our design
4 Summary
In this part of the design patterns series we will take a look at the observer design pattern.
1 Introduction
2 What is the observer pattern?
3 The Design
4 Implementing our design
5 Aren’t events already in .NET?
6 Summary
In this part of the design patterns series we will take a look at the factory pattern.
1 Introduction
2 The simple factory
3 Factory pattern
4 Summary
In this part of the design patterns series we will look at the singleton pattern.
1 Introduction
2 How is a singleton typically implemented?
3 The static modifier
4 Issues with our first design
5 beforefieldinit
6 Summary
7 Acknowledgements
8 References
So what are you waiting for? Start reading the articles!

Denis has been working with SQL Server since version 6.5. Although he worked as an ASP/JSP/ColdFusion developer before the dot com bust, he has been working exclusively as a database developer/architect since 2002. In addition to English, Denis is also fluent in Croatian and Dutch, but he can curse in many other languages and dialects (just ask the SQL optimizer) He lives in Princeton, NJ with his wife and three kids.