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Type safety: When you compile an application,.

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NET adds information to your assembly that indicates details such as the available classes, their members, their data types, and so on. As a result, other applications can use them without requiring additional support files, and the compiler can verify that every call is valid at runtime. This extra layer of safety completely obliterates whole categories of low-level errors. Extensible metadata: The information about classes and members is only one of the types of metadata that.

NET stores in a compiled assembly. Metadata describes your code and allows you to provide additional information to the runtime or other services. For example, this metadata might tell a debugger how to trace your code, or it might tell Visual Studio how to display a custom control at design time. You could also use metadata to enable other runtime services, such as transactions or object pooling. Structured error handling:. NET languages offer structured exception handling, which allows you to organize your error-handling code logically and concisely. You can create separate blocks to deal with different types of errors.

You can also nest exception handlers multiple layers deep.

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Multithreading: The CLR provides a pool of threads that varios classes can use. For example,you can call methods, read files, or communicate with web services asynchronously, without needing to explicitly create new threads. Figure shows a high-level look at the CLR and the. NET Framework. The CLR and the. On the other hand, ASP. NET is truly object-oriented.

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Not only does your code have full access to all objects in the. For example, you can create reusable classes, standardize code with interfaces, extend existing classes with inheritance, and bundle useful functionality in a distributable, compiled component. One of the best examples of object-oriented thinking in ASP. NET is found in server-based controls.

Server-based controls are the epitome of encapsulation.

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Developers can manipulate control objects programmatically using code to customize their appearance, provide data to display,and even react to events. The low-level HTML markup that these controls render is hidden away behind the scenes. In this way, ASP. NET was first created, two schools of thought existed. Some ASP.

This approach allows you to create ASP. However, another set of ASP. NET developers saw the promise of something more-rich server-side controls that didn't just emulate individual HTML tags. These controls might render their interface from dozens of distinct HTML elements while still providing a simple object-based interface to the programmer. Using this model, developers could work with programmable menus, calendars, data lists, validators, and so on. After some deliberation, Microsoft decided to provide both models.

Along with these are ASP. NET web controls, which provide a higher level of abstraction and more functionality. In most cases, you'll use HTML server-side controls for backward compatibility and quick migration, and use web controls for new projects. NET web control tags always start with the prefix asp: followed by the class name. The HtmlInputText. However, web controls don't place the same emphasis on correlating with HTML syntax, so the more descriptive property name Text is used instead.

The ASP. NET web control variants provide similar functionality, although the web controls tend to expose a more standardized, streamlined interface. This makes the web controls easy to learn, and it also means they're a natural fit for Windows developers moving to the world of the Web, because many of the property names are similar to the corresponding Windows controls. You can now work with events that it generates, set attributes, and bind it to a data source.

The end result is that a string of text appears in a text box on the HTML page that's rendered and sent to the client. Fact 6: ASP. NET Is Multidevice and Multibrowser One of the greatest challenges web developers face is the wide variety of browsers they need to support. Different browsers, versions, and configurations differ in their support of HTML.

Web developers need to choose whether they should render their content according to HTML 3. Life gets even more complicated if you want to use an HTML extension such as JavaScript to create a more dynamic page or provide validation.

NET addresses this problem in a remarkably intelligent way. Although you can retrieve information about the client browser and its capabilities in an ASP. NET actually encourages developers to ignore these considerations and use a rich suite of web server controls.

These server controls render their HTML adaptively by taking the client's capabilities into account. One example is ASP. This allows the validation controls to show dynamic error messages without the user needing to send the page back to the server for more processing.

These features are optional, but they demonstrate how intelligent controls can make the most of cutting-edge browsers without shutting out other clients. Best of all, you don't need any extra coding work to support both types of client. Note Unfortunately, ASP. As a result,if you want to create web pages for smart devices such as mobile phones, PDAs personal digital assistants , and so on, you need to use a similar but separate toolkit.

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However, this feature was cut late in the beta cycle. Fact 7: ASP. NET Is Easy to Deploy and Configure One of the biggest headaches a web developer faces during a development cycle is deploying a completed application to a production server. Not only do the web-page files, databases, and components need to be transferred, but components need to be registered and a slew of configuration settings need to be re-created.

Pro Aspnet For Sql Server High Performance Data Access For Web Developers

NET simplifies this process considerably. Every installation of the. NET Framework provides the same core classes. As a result, deploying an ASP. NET application is relatively simple.

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For no-frills deployment, you simply need to copy all the files to a virtual directory on a production server using an FTP program or even a command-line command like XCOPY. As long as the host machine has the. NET Framework, there are no timeconsuming registration steps.

Chapter 18 covers deployment in detail. Distributing the components your application uses is just as easy. All you need to do is copy the component assemblies along with your website files when you deploy your web application. Because all the information about your component is stored directly in the assembly file metadata,there's no need to launch a registration program or modify the Windows registry.

As long as youplace these components in the correct place the Bin subdirectory of the web application directory ,the ASP. NET engine automatically detects them and makes them available to your web-page code. Try that with a traditional COM component. Configuration is another challenge with application deployment, particularly if you need to transfer security information such as user accounts and user privileges. Instead, most ASP. NET settings are stored in a dedicated web. The web.

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It contains a hierarchical grouping of application settings stored in an easily readable XML format that you can edit using nothing more than a text editor such as Notepad. When you modify an application setting, ASP. NET notices that change and smoothly restarts the application in a new application domain keeping the existing application domain alive long enough to finish processing any outstanding requests.