Jack @ ASP.NET

The “EF Code-First” functionality provides a pretty nice code-centric way to work with data.

Advantage

• ·         Develop without ever having to open a designer or define an XML mapping file, and start from a class
• ·         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. columbus oh website design

Disadvantage

• Mapping entities to the database is quite complex
• There is no Model diagram

Key characteristics of VIEW
? The view is a visual element, such as a window, page, user control, or data template. The view defines the controls contained in the view and their visual layout and styling.
? The view references the view model through its DataContext property. The controls in the view are data bound to the properties and commands exposed by the view model.
? The view may customize the data binding behavior between the view and the view model. For example, the view may use value converters to format the data to be displayed in the UI, or it may use validation rules to provide additional input data validation to the user.
? The view defines and handles UI visual behavior, such as animations or transitions that may be triggered from a state change in the view model or via the user’s interaction with the UI.
? The view’s code-behind may define UI logic to implement visual behavior that is difficult to express in XAML or that requires direct references to the specific UI controls defined in the view.

Key characteristics of’ ‘VIEWMODEL’
? The view model is a non-visual class and does not derive from any WPF or Silverlight base class. It encapsulates the presentation logic required to support a use case or user task in the application. The view model is testable independently of the view and the model.
? The view model typically does not directly reference the view. It implements properties and commands to which the view can data bind. It notifies the view of any state changes via change notification events via the INotifyPropertyChanged and INotifyCollectionChanged interfaces.
? The view model coordinates the view’s interaction with the model. It may convert or manipulate data so that it can be easily consumed by the view and may implement additional properties that may not be present on the model. It may also implement data validation via the IDataErrorInfo or INotifyDataErrorInfo interfaces.
? The view model may define logical states that the view can represent visually to the user.

Key characteristics of ‘MODEL’
? Model classes are non-visual classes that encapsulate the application’s data and business logic. They are responsible for managing the application’s data and for ensuring its consistency and validity by encapsulating the required business rules and data validation logic.
? The model classes do not directly reference the view or view model classes and have no dependency on how they are implemented.
? The model classes typically provide property and collection change notification events through the INotifyPropertyChanged and INotifyCollectionChanged interfaces. This allows them to be easily data bound in the view. Model classes that represent collections of objects typically derive from the ObservableCollection<T> class.
? The model classes typically provide data validation and error reporting through either the IDataErrorInfo or INotifyDataErrorInfo interfaces.
? The model classes are typically used in conjunction with a service or repository that encapsulates data access and caching.

Here are some suggestions for the fresh graduates and the college freshmen on how to become a good programmer.

1. Strong skill of one or more good languages like C++, Java and C#.
2. Write an implementation plan (or model).
3. Deep knowledge of OOP.
4. Know most common algorithms well
5. Be skilled in debugging in IDEs
6. Add Comments to your code.
7. Organize your code
8. Test (Unit Test)
9. Practice
10. Read codes from others

In general, the online advertising market, pricing model three, marketers can use it to buy advertising and potential customers.

Cost per thousand impressions (per thousand) pricing model display ads – that is, when many people are advertising. CPM display advertising pricing model is usually sold. Problem is CPM advertising is the advertiser’s fees, even if the target audience not to click (or even view) the ad.

CPC costs (per click) advertisers receive overcome this problem, only when the consumer clicks on the ad. However, due to increased competition, keyword search has become very expensive. Double-click the Performics 2007 search trends report shows that in January 2007 cost-per-click (CPC) of less than $ 1 more than the same period last year by nearly six times the number of keywords. The cost for each keyword an increase of 33% per visit up to 55% of the costs.

CPL cost (per line) advertising costs CPM and the Communist Party leadership to resolve the only risk. Every time the leadership of the Communist Party of increased demand for the same price. Also like the Communist Party’s commitment to providors way to create a chance or mixed with another (for example – search for clues leads and joint registration) fraud led to the source to generate higher profits.

Marketers who are willing to pay the specific actions will only have two choices: CPL advertising (or online lead generation), and CPA advertising activities in the CPL (. Also known as affiliate marketing are known), interested advertisers pay Lead – Advertisers who are interested in that product or service contact information. CPL’s activities is to brand marketers and direct response marketers, see the contact point for customers – by creating a community site, Membership Rewards program or acquisition plans mailing list. Activities in the certified public accountants, advertisers usually pay the credit card transaction has been completed, involved the sale. CPA is all about ‘now’ – this is a consumer purchase, focusing on the promotion of the moment. If a site does not have the tourists to buy things, there is no simple way to remarket them.

Some of the big improvements in EF4 include:

EF4 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