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Different Design Patterns

Creational Patterns
Abstract Factory	Creates an instance of several families of classes
Builder	Separates object construction from its representation
Factory Method	Creates an instance of several derived classes
Prototype	A fully initialized instance to be copied or cloned
Singleton	A class of which only a single instance can exist

Structural Patterns
Adapter	Match interfaces of different classes
Bridge	Separates an object’s interface from its implementation
Composite	A tree structure of simple and composite objects
Decorator	Add responsibilities to objects dynamically
Facade	A single class that represents an entire subsystem
Flyweight	A fine-grained instance used for efficient sharing
Proxy	An object representing another object

Behavioral Patterns
Chain of Resp.	A way of passing a request between a chain of objects
Command	Encapsulate a command request as an object
Interpreter	A way to include language elements in a program
Iterator	Sequentially access the elements of a collection
Mediator	Defines simplified communication between classes
Memento	Capture and restore an object's internal state
Observer	A way of notifying change to a number of classes
State	Alter an object's behavior when its state changes
Strategy	Encapsulates an algorithm inside a class
Template Method	Defer the exact steps of an algorithm to a subclass
Visitor	Defines a new operation to a class without change

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Entity Framework 4

Scott Guthrie has written a nice post on his blog on Entity Framework. I am sharing an extract of his post.

Found his original Post here: http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx

.NET 4 ships with a much improved version of Entity Framework (EF) – a data access library that lives in the System.Data.Entity namespace.

When Entity Framework was first introduced with .NET 3.5 SP1, developers provided a lot of feedback on things they thought were incomplete with that first release.  The SQL team did a good job of listening to this feedback, and really focused the EF that ships with .NET 4 on addressing it. 

Some of the big improvements in EF4 include:

• POCO Support: You can now define entities without requiring base classes or data persistence attributes.
• Lazy Loading Support: You can now load sub-objects of a model on demand instead of loading them up front.
• N-Tier Support and Self-Tracking Entities: Handle scenarios where entities flow across tiers or stateless web calls.
• Better SQL Generation and SPROC support: EF4 executes better SQL, and includes better integration with SPROCs
• Automatic Pluralization Support: EF4 includes automatic pluralization support of tables (e.g. Categories->Category).
• Improved Testability: EF4’s object context can now be more easily faked using interfaces.
• Improved LINQ Operator Support: EF4 now offers full support for LINQ operators.

Visual Studio 2010 also includes much richer EF designer and tooling support. The EF designer in VS 2010 supports both a “database first” development style – where you construct your model layer on a design surface from an existing database.  It also supports a “model first” development style – where you first define your model layer using the design surface, and can then use it to generate database schema from it.

Code-First Development with EF

In addition to supporting a designer-based development workflow, EF4 also enables a more code-centric option which we call “code first development”.  Code-First Development enables a pretty sweet development workflow.  It enables you to:

• Develop without ever having to open a designer or define an XML mapping file
• Define your model objects by simply writing “plain old classes” with no base classes required
• Use a “convention over configuration” approach that enables database persistence without explicitly configuring anything
• Optionally override the convention-based persistence and use a fluent code API to fully customize the persistence mapping

EF’s “code first development” support is currently enabled with a separate download that runs on top of the core EF built-into .NET 4.  CTP4 of this “code-first” library shipped this week and can be downloaded here. 

It works with VS 2010, and you can use it with any .NET 4 project (including both ASP.NET Web Forms and ASP.NET MVC).

 

Found his original Post here: http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx