Which Design Patterns are you using most frequently in your projects?

Observer Pattern
Iterator Pattern
Decorator Pattern
Adapter Pattern
Factory Pattern
Strategy Pattern
Composite Pattern in ASP.NET
Template Method Pattern
Intercepting Filter Pattern
Page Controller Pattern

If you are a dotnet developer, then this link will help you to know which are the patterns used in dotnet framwork.
http://msdn.microsoft.com/en-us/magazine/cc188707.aspx#S1

Hi,

In most of my applications, I have used following Design Patterns:

1. MVC passive Model with ASP.NET in front end
2. MVP Passive Model with ASP.NET in front end
3. Proxy Pattern (every one knows where we use this :) )
4. Facade (Service Patterns)
5. Observer (Error logging, Table dependancy or File Dependancy)
6. Strategy (Hashing algorithms and Email formats)
7. Abstract Factory
8. Command (Master Page with custom base class)
9. Template (Master Pages)

Thanks,
Chinna Srihari

1. n-tier architecture
2. Singleton
3. Factory
4. Adapter
5. Iterator (LINQ)

My list is somewhat similar:

1. Layers (n-Tier architecture)
   
2. Facade (Service Layer)
   
3. Iterator (LINQ really)
   
4. Singleton
5. Factory
6. Proxy
7. MVC  (ASP.NET MVC)
   
8. MVVM (Silverlight)