Electronic commerce, commonly known as e-commerce or eCommerce, consists of the buying and selling of products or services over electronic systems such as the Internet and other computer networks. The amount of trade conducted electronically has grown extraordinarily with widespread Internet usage. The use of commerce is conducted in this way, spurring and drawing on innovations inelectronic funds transfer, supply chain management, Internet marketing, online transaction processing,electronic data interchange (EDI), inventory management systems, and automated data collection systems. Modern electronic commerce typically uses the World Wide Web at least at some point in the transaction's lifecycle, although it can encompass a wider range of technologies such as e-mail as well. A large percentage of electronic commerce is conducted entirely electronically for virtual items such as access to premium content on a website, but most electronic commerce involves the transportation of physical items in some way. Online retailers are sometimes known as e-tailers and online retail is sometimes known as e-tail. Almost all big retailers have electronic commerce presence on the World Wide Web. Electronic commerce that is conducted between businesses is referred to as business-to-business or B2B. B2B can be open to all interested parties (e.g. commodity exchange) or limited to specific, pre-qualified participants (private electronic market). Electronic commerce that is conducted between businesses and consumers, on the other hand, is referred to as business-to-consumer or B2C. This is the type of electronic commerce conducted by companies such as Amazon.com. Online shopping is a form of electronic commerce where the buyer is directly online to the seller's computer usually via the internet. There is no intermediary service. The sale and purchase transaction is completed electronically and interactively in real-time such as Amazon.com for new books. If an intermediary is present, then the sale and purchase transaction is called electronic commerce such as eBay.com. Electronic commerce is generally considered to be the sales aspect of e-business. It also consists of the exchange of data to facilitate the financing and payment aspects of the business transactions.
Sunday, December 5, 2010
Electronic commerce
Thursday, December 2, 2010
Partial Classes in .NET
One of the greatest benefits of partial classes is that it allows a clean separation of business logic and the user interface (in particular the code that is generated by the visual designer). Using partial classes, the UI code can be hidden from the developer, who usually has no need to access it anyway. Partial classes will also make debugging easier, as the code is partitioned into separate files.
So, what are the uses for partial classes?
Here are some good reasons to use partial classes:
1. They allow programmers on your team to work on different parts of a class without needing to share the same physical file. While this is useful for projects that involve big class files, be wary: If you find your class file getting too large, it may well signal a design fault and re-factoring may be required.
2. The most compelling reason for using partial class is to separate your application business logic from the designer-generated code. For example, the code generated by Visual Studio 2005 for a Windows Form is kept separate from your business logic (we will discuss this in a later section). This will prevent developers from messing with the code that is used for the UI. At the same time, it will prevent you from losing your changes to the designer-generated code when you change the UI.
jQuery Releases on the CDN
The following releases of jQuery are hosted on the CDN:
jQuery version 1.4.4
jQuery version 1.4.3
jQuery version 1.4.2
jQuery version 1.4.1
jQuery version 1.4
jQuery version 1.3.2
jQuery version 1.4.4
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.4.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.4.min.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.4-vsdoc.js
jQuery version 1.4.3
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.3.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.3.min.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.3-vsdoc.js
jQuery version 1.4.2
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.2.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.2.min.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.2-vsdoc.js
jQuery version 1.4.1
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.1.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.1.min.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.1-vsdoc.js
jQuery version 1.4
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.min.js
jQuery version 1.3.2
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.3.2.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.3.2.min.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.3.2-vsdoc.js
- http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.3.2.min-vsdoc.js
jQuery UI Releases on the CDN
The following releases of the jQuery UI library are hosted on this CDN. Click each link to see the actual list of files.jQuery Validation Releases on the CDN
The following releases of the jQuery Validation library are hosted on this CDN. Click each link to see the actual list of files.jQuery Templates Releases on the CDN
The following releases of the jQuery Templates plugin are hosted on this CDN. Click each link to see the actual list of files.jQuery Cycle Releases on the CDN
The following releases of the jQuery Cycle plugin are hosted on this CDN. Click each link to see the actual list of files.Using ASP.NET Ajax from the CDN
When using ASP.NET 4, you can redirect all requests for ASP.NET framework scripts to the CDN. Retrieving scripts from the CDN instead of your local web server can substantially improve the performance of public ASP.NET websites.
Use the ScriptManager EnableCDN property to redirect all ASP.NET framework script requests to the Microsoft Ajax CDN:
- <asp:ScriptManager
- ID="ScriptManager1"
- EnableCdn="true"
- Runat="Server" />
ajax.microsoft.com renamed to ajax.aspnetcdn.com
The CDN used to use the microsoft.com domain name and has been changed to use the aspnetcdn.com domain name. This change was made to increase performance because when a browser referenced the microsoft.com domain it would send any cookies from that domain across the wire with each request. By renaming to a domain name other than microsoft.com performance can be increased by as much to 25%. Note ajax.microsoft.com will continue to function but ajax.aspnetcdn.com is recommended.
The new format does not support SSL yet, so if you need to use SSL you should use the older format until we get SSL enabled on the new format.
- Old Format: http://ajax.microsoft.com/ajax/jQuery/jquery-1.4.4.js
- New Format: http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.4.js
The new format does not support SSL yet, so if you need to use SSL you should use the older format until we get SSL enabled on the new format.
jQuery UI on the Microsoft CDN
You can start using jQuery UI in your ASP.NET websites by linking to jQuery UI at the following address:
http://ajax.microsoft.com/ajax/jquery.ui/1.8.5/jquery-ui.js
You can start using the CDN now for free. No registration is required.
Using jQuery UI from the CDN can substantially improve the performance of your production ASP.NET websites. The Microsoft CDN is composed of servers distributed around the world. When users request a page from your website, the users can retrieve jQuery UI from a server located geographically close to them.
In addition, because browsers cache JavaScript files relative to a domain, serving jQuery UI from a CDN enables your website users to avoid downloading jQuery UI when visiting multiple websites. If you visit two websites that both use jQuery UI from the Microsoft CDN then the jQuery UI library only needs to be downloaded once.
Learn more about the Microsoft Ajax CDN by visiting the following website:
http://www.asp.net/ajaxlibrary/cdn.ashx
This website is being updated with the location of all of the jQuery UI library files.
jQuery made simple!
To get a feel for what jQuery UI is capable of, check out the UI demos.
In the demos section, the navigation lists all of the interactions and widgets that jQuery UI offers. Choose an interaction or widget and you'll be presented with several demo configurations for that particular plugin. Each demo allows you to view source code, change themes, and the URL can always be bookmarked.
You can download the attached file to start work with jQuery. To start using jQuery just add the following line to your code:
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
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