2: Building Web Applications in .NET

Maker QR-Code in .NET 2: Building Web Applications

2: Building Web Applications
QR Code Generation In Visual Studio .NET
Using Barcode printer for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
www.OnBarcode.com
GS1-128 Drawer In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create GS1 128 image in ASP.NET applications.
www.OnBarcode.com
Then, with shocking disregard for security, use a label control to repeat the user s password back to him. The page should look something like Figure 2-22.
Creating Barcode In VS .NET
Using Barcode generation for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
UPC Code Generation In VS .NET
Using Barcode creation for ASP.NET Control to generate, create GTIN - 12 image in ASP.NET applications.
www.OnBarcode.com
Exercise 2-4. Now you re ready to try a slightly more complicated example. Create a drop-down list that presents a number of fine books from your authors; call it ddlBookList. This time, the Text and Value properties of the ListItems in the dropdown should be different, according to the following table:
Barcode Creator In VS .NET
Using Barcode creator for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Encode Barcode In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Text Programming ASP.NET Programming C# Programming Visual Basic.NET Learning C# 2005 Value 00916X 006993 004385 102097
2D Printer In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create Matrix image in ASP.NET applications.
www.OnBarcode.com
Draw Leitcode In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create Leitcode image in ASP.NET applications.
www.OnBarcode.com
These values are part of each book s ISBN, and were you a bookstore or a warehouse, you would probably use a database with these numbers to help keep track of the books you have in stock. In this case, though, you ll just show the user what they selected, including the value. Add two labels to show the results, as shown in Figure 2-23.
QR Code JIS X 0510 Generator In Java
Using Barcode generation for Java Control to generate, create QR Code ISO/IEC18004 image in Java applications.
www.OnBarcode.com
Making QR Code 2d Barcode In None
Using Barcode creation for Office Word Control to generate, create QR-Code image in Office Word applications.
www.OnBarcode.com
Exercises
Draw UPC A In Visual Studio .NET
Using Barcode maker for Reporting Service Control to generate, create UPCA image in Reporting Service applications.
www.OnBarcode.com
Making Barcode In Java
Using Barcode encoder for BIRT reports Control to generate, create Barcode image in BIRT reports applications.
www.OnBarcode.com
|
Making QR Code In None
Using Barcode creation for Word Control to generate, create QR Code ISO/IEC18004 image in Microsoft Word applications.
www.OnBarcode.com
European Article Number 13 Reader In C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
64 |
Make Quick Response Code In None
Using Barcode drawer for Software Control to generate, create QR Code JIS X 0510 image in Software applications.
www.OnBarcode.com
European Article Number 13 Creation In Java
Using Barcode creation for Eclipse BIRT Control to generate, create EAN13 image in Eclipse BIRT applications.
www.OnBarcode.com
2: Building Web Applications
Create GS1 - 13 In C#.NET
Using Barcode drawer for .NET Control to generate, create EAN-13 Supplement 5 image in .NET framework applications.
www.OnBarcode.com
Make USS Code 128 In Java
Using Barcode generation for Eclipse BIRT Control to generate, create Code-128 image in Eclipse BIRT applications.
www.OnBarcode.com
3
Denso QR Bar Code Maker In .NET
Using Barcode maker for Reporting Service Control to generate, create QR Code image in Reporting Service applications.
www.OnBarcode.com
ECC200 Encoder In Visual Basic .NET
Using Barcode drawer for .NET framework Control to generate, create Data Matrix image in .NET framework applications.
www.OnBarcode.com
Snappier Web Sites with AJAX
AJAX has revolutionized ASP.NET, and from this moment forward most ASP.NET applications will routinely integrate AJAX controls. AJAX moves ASP.NET applications from being 99% server-side code, to offering the option for a great deal of the processing to happen on the user s browser. The net effect is a tremendous increase in both real and perceived performance of ASP.NET applications. To demonstrate how much more dynamic and responsive AJAX is, you ll rewrite the order form from 2, applying Ajax techniques. You ll enhance the site by adding a watermark to user entry fields. A watermark is a bit of text that appears in the text field itself, but disappears as soon as the user starts typing. It serves as an elegant prompt to the user. You will also create a pop-up panel to hide controls until the user needs them, and you ll add a collapsible text field to display product information in a very space-efficient manner.
Take a Walk on the Client Side
While server-based web applications have wonderful advantages, they have the obvious disadvantage that any time you want to run any code (or retrieve any data) you must endure the cost of a round trip from the browser to the server and back, and the page must be redrawn from scratch. Round trips can be slow (though the Internet is getting faster all the time) and redrawing the page causes a noticeable flicker. AJAX (which more accurately should be spelled AJX, but that s harder to pronounce) is an acronym for Asynchronous JavaScript and XML that is, it is a technique for combining well established (some might say old) Internet technology in new ways to greatly enhance the performance of web applications. AJAX enabled applications are very hot they out-perform server-based applications in ways that would make your jaw drop. Microsoft, realizing this was not a technology they could ignore, and having learned the lesson that they must leave open standards open, chose to take this very good idea and make it much much better, without making it proprietary.
AJAX Doesn t Exist
There really isn t any such thing as AJAX. It isn t a product or a standard; it isn t even a technology. It is just a way to refer to a set of existing technologies used together in new ways, to do cool things. The first use of the term as an acronym for Asynchronous JavaScript and XML was by Jesse James Garrett in February 2005. Garrett thought of the term while in the shower (if you must know), when he realized the need for a shorthand term to represent the suite of technologies he was proposing to a client (who, we are assured, was not in the shower with him). On the other hand, the first use of the term at all, may have been nearly 3000 years earlier, by Homer, who wrote about Ajax the Great (and also Ajax the Lesser) in the Iliad (Book 7, 181 312). Ajax the Great was the tallest and strongest of the Achaeans, and second only to Achilles in skill as a warrior. It isn t clear if the tale of AJAX-The-Technology will be told 3,000 years from today (or even 3,000 days); though we re pretty certain there is a parallel between the Trojan War and the desktop wars, but that is for another book. According to Garret, AJAX...is really several technologies, each flourishing in its own right, coming together in powerful new ways. AJAX incorporates: Standards-based presentation using XHTML and CSS; with dynamic display and interaction using the Document Object Model (DOM). This allows AJAX, through JavaScript code, to directly manipulate any element on the page. Data interchange and manipulation using XML and XSLT, a non-proprietary and platform independent way of working with data, allowing AJAX to work on any platform using industry standard technology. Asynchronous data requests and retrieval using the XMLHttpRequest object to request units of information comprising less than an entire page. This has two very important benefits: much less information needs to be sent through the wire, and the browser can continue working with other portions of a page while waiting for a response from the server. Heavy emphasis on client-side processing, to eliminate as many round trips as possible and to greatly improve the performance of the application. JavaScript binds everything together. Ajax takes advantage of the industry standard scripting language that is implemented by virtually every browser on every desktop.
They did so by combining the power, speed, and flexibility of AJAX with the drag and drop simplicity of ASP.NET. They created a library of AJAX controls that are as easy to use as the server-side ASP.NET controls we ve been using since the Middle Ages. Even more important, they made it relatively easy to create your own drag and drop AJAX controls.
66 |
Copyright © OnBarcode.com . All rights reserved.