ASP.NET Dynamic Data

ASP.NET Dynamic Data Introduction

Many definition about ASP.NET Dynamic Data.

ASP.NET Dynamic Data is a web application scaffolding framework from Microsoft, shipped as an extension to ASP.NET, that can be used to build data driven web applications. It exposes tables in a database by encoding it in the URI of the ASP.NET web service, and the data in the table is automatically rendered to HTML. The process of rendering can be controlled using custom design templates. Internally, it discovers the database schema by using the database metadata.

ASP.NET Dynamic Data is a framework that lets you create data-driven ASP.NET Web applications easily. It does this by automatically discovering data-model metadata at run time and deriving UI behavior from it. A scaffolding framework provides a functional Web site for viewing and editing data. You can easily customize the scaffolding framework by changing elements or creating new ones to override the default behavior. Existing applications can easily integrate scaffolding elements with ASP.NET pages.

That definition was take from msdn.microsoft.com and wikipedia.org for comparison. So, what are the definition from ASP.NET Dynamic Data. ASP.NET Dynamic data is new controls for DetailsView, FormView, GridView, or ListView controls along with a lot of meta-infrastructure classes to make it possible. The design uses convention over configuration in a number of places, and this marks, IMHO, the recognition of a simpler way to do things.

ASP.NET Dynamic Data brings major usability and RAD development changes to the existing ASP.NET data controls. RAD development is significantly increased by the use of a rich scaffolding framework. After you add a LINQ to SQL or Entity Framework data model to a project, you can simply register it with Dynamic Data. The result is a fully functional Web site. Full CRUD (create, read, update, and delete) operations are supported. The site includes filtering by foreign keys and Boolean fields; foreign keys are automatically converted to their friendly names. Smart validation is automatically available, which provides validation based on database constraints for nullable fields, data type, and field length.

ASP.NET Dynamic Data Features:

• The ability to render data by defining templates, either at the page-level (for example, to define default renderings for list, details, edit, and insert pages) or the field-level (for example, to define default renderings for different data field types or foreign key relationships). This feature allows you to update data templates in a single location, which will take effect across your entire site for the various objects/schema in your data model.


• The ability to specify metadata on the data model that defines custom validation rules or display hints. The metadata that you define on the model results in custom behavior for performing rendering (for example, which field template to use on a given column/property) as well as custom validation logic in your Website UI and also when the data model is used programmatically from code.


• Support for more data access layers - ADO.NET Data Services (formerly Astoria);
  Custom Business Logic Layer


• Field Templates - URL, E-mail, and Enumeration


• Entity Templates - Automatic tempalates for ListView, FormView; Template based on entity instead of field


• Inheritance Support (EF and Linq2SQL)


• QueryBlock - Rich Declarative Linq Expressions


• Rich Filtering - Attributes and templates


• MVC Support
  

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ASP.NET vs ASP Classic

What is ASP.NET ?

ASP.NET attempts to simplify developers' transition from Windows application development to web development by offering the ability to build pages composed of controls similar to a Windows user interface. A web control, such as a button or label, functions in very much the same way as its Windows counterpart: code can assign its properties and respond to its events. Controls know how to render themselves: whereas Windows controls draw themselves to the screen, web controls produce segments of HTML and JavaScript which form part of the resulting page sent to the end-user's browser.

ASP.NET encourages the programmer to develop applications using an event-driven GUI model, rather than in conventional web-scripting environments like ASP and PHP. The framework attempts to combine existing technologies such as JavaScript with internal components like "ViewState" to bring persistent (inter-request) state to the inherently stateless web environment.

What is ASP ?

Active Server Pages or ASP, as it is more commonly known, is a technology that enables you to make dynamic and interactive web pages.

ASP uses server-side scripting to dynamically produce web pages that are not affected by the type of browser the web site visitor is using.

The default scripting language used for writing ASP is VBScript, although you can use other scripting languages like JScript (Microsoft's version of JavaScript).

ASP pages have the extension .asp instead of .htm, when a page with the extension .asp is requested by a browser the web server knows to interpret any ASP contained within the web page before sending the HTML produced to the browser. This way all the ASP is run on the web server and no ASP will ever be passed to the web browser.

Any web pages containing ASP cannot be run by just simply opening the page in a web browser. The page must be requested through a web server that supports ASP, this is why ASP stands for Active Server Pages, no server, no active pages.

As ASP was first introduced by Microsoft on it's web server, Internet Information Services (IIS), that runs on Windows 2000/XP Pro/NT4, it is this web server that ASP pages usually run best on.

For those of you running Windows and wish to play around with ASP on your own system you will need to install Microsoft's Internet Information Services (IIS). Lucky IIS or its micro version Personal Web Server (PWS) comes free with Windows.


compared ASP.NET to ASP classic are:

• Compiled code means applications run faster with more design-time errors trapped at the development stage.
  
• Significantly improved run-time error handling, making use of exception handling using try-catch blocks.
  
• Similar metaphors to Microsoft Windows applications such as controls and events.
  
• An extensive set of controls and class libraries allows the rapid building of applications, plus user-defined controls allow commonly-usedweb template , such as menus. Layout of these controls on a page is easier because most of it can be done visually in most editors.
  
• ASP.NET leverages the multi-language capabilities of the .NET Common Language Runtime, allowing web pages to be coded in VB.NET, C#, J#, Delphi.NET, Chrome etc.
  
• Ability to cache the whole page or just parts of it to improve performance.
  
• Ability to use the code-behind development model to separate business logic from presentation.
  
• If an ASP.NET application leaks memory, the ASP.NET runtime unloads the AppDomain hosting the erring application and reloads the application in a new AppDomain.
  
• Session state in ASP.NET can be saved in a Microsoft SQL Server database or in a separate process running on the same machine as the web server or on a different machine. That way session values are not lost when the web server is reset or the ASP.NET worker process is recycled.
  
• Versions of ASP.NET prior to 2.0 were criticized for their lack of standards compliance. The generated HTML and JavaScript sent to the client browser would not always validate against W3C/ECMA standards. In addition, the framework's browser detection feature sometimes incorrectly identified web browsers other than Microsoft's ownInternet Explorer as "downlevel" and returned HTML/JavaScript to these clients with some of the features removed, or sometimes crippled or broken. However, in version 2.0, all controls generate valid HTML 4.0, XHTML 1.0 (the default) or XHTML 1.1 output, depending on the site configuration. Detection of standards-compliant web browsers is more robust and support forCascading Style Sheets is more extensive.
  
• Web Server Controls: these are controls introduced by ASP.NET for providing the UI for the web form. These controls are state managed controls and areWYSIWYG controls.

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