經常關注我的Blog的朋友可能注意到了，在我Blog的左邊系列文章中，已經移除了對Atlas學習手記系列文章的推薦，因爲隨着ASP.NET AJAX 1.0 Beta版的發佈，它們已經不再適用，爲了不繼續誤導廣大朋友，所以不再作爲推薦系列文章，如果有需要參考的朋友，可以直接到隨筆分類中查看。
ASP.NET AJAX Beta改動如此之大，鑑於又沒有很好的中文參考資料，所以決定最近開始寫作ASP.NET AJAX入門系列，這個系列我會把ASP.NET AJAX當作一個全新的東西去對待，不再考慮以前的Atlas，把自己對ASP.NET AJAX的研究與大家分享，便於初學的朋友少走一些彎路。對Atlas熟悉的朋友可以推薦看Dflying
Chen的《擁抱變化——從Atlas到ASP.NET AJAX系列》，以及老趙的《深入Atlas系列》。由於個人的能力和掌握的程度有限
，難免出現錯誤和遺漏的地方，還請大家多多理解和指正。
OK，讓我們從這裏開始！
一．ASP.NET AJAX組成部分
在ASP.NET AJAX官方網站上有如下三個下載：
1．ASP.NET AJAX：這部分是ASP.NET AJAX的核心部分，包括了核心AJAX類型系統，網絡協議層(networking stack)，組件模型，擴展器(extender)基類，以及與ASP.NET集成的服務器端功能(包括廣受歡迎的ScriptManager，UpdatePanel，和
Timer控件)。功能列表如下：
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服務端功能列表
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Asynchronous client-to-server networking
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Authentication as a Web service
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ControlExtender class
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Profile as a Web service
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ScriptManager and ScriptManagerProxy controls
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Static page methods as Web services
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Timer control
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UpdatePanel control
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UpdateProgress control
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客戶端功能列表
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Authentication for JavaScript
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Behavior class
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Calling .asmx Web services from JavaScript
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Component class
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Control class
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Debug class
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JavaScript Array type extensions
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JavaScript Boolean type extensions
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JavaScript Error type extensions
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JavaScript Number type extensions
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JavaScript Object type extensions
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JavaScript String type extensions
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JSON serialization
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Profile for JavaScript
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Trace class
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2．ASP.NET AJAX “Value-Add”CTP：ASP.NET AJAX社區支持的“增值”CTP部分，包括了以前各個Atlas CTP版本包含的，但並不在完全支持的“核心”1.0 版本內的額外的高級特性。通過進一步的反饋，這些將會逐步穩定的增加到核心1.0中去。功能列表如下：
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服務端功能列表
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AutoCompleteExtender class
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Cross-browser Web Parts drag-and-drop
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DragOverlayExtender control
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PopupExtender class
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客戶端功能列表
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Actions components
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AutoCompleteBehavior class
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BatchResponse class
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Binding component
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Button control
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Checkbox control
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Click behavior
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Counter class
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Cross-browser Web Parts
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Data control
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DragDropList control
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DragDropManager component
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DraggableListItem control
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FadeAnimation component
Floating behavior
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Hover behavior
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Hyperlink control
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Image control
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Input control
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Label control
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Layout behavior
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Opacity behavior
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Popup behavior
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Selector control
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ServiceMethodRequest class
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Sys.Data and Sys.UI.Data namespaces
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Textbox control
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Timer control
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Validator controls
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xml-script support
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3．ASP.NET AJAX Control Toolkit：包含了基於ASP.NET AJAX 1.0 版“核心”下載版本的28個非常酷的免費AJAX控件。它是一個開源項目，由微軟和非微軟開發人員共同開發的，去CodePlex下載代碼。
二．安裝ASP.NET AJAX
1．在安裝ASP.NET AJAX 1.0 Beta之前，需要先卸載以前所有的CTP版本。
2．下載ASP.NET AJAX 1.0 Beta安裝包，安裝時Microsoft.Web.Extensions.dll程序集將被安裝在GAC（Global Assembly Cache）中，所以使用時不需要再在Web站點的Bin文件夾中包括該程序集。
3．下載安裝ASP.NET AJAX “Value-Add”CTP和ASP.NET AJAX Control Toolkit。列表如下：
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名稱
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描述
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Accordion:
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Create efficient UI from multiple panes with this animated control.
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AlwaysVisibleControl
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Docks a panel to a corner of the browser window and keeps it visible even when the user scrolls.
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Animation
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Adds powerful, easy to use animations to any element or control.
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CascadingDropDown
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Easily link drop downs, complete with asynchronous population and no postbacks!
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CollapsiblePanel
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This extender allows panels on your page to collapse and expand with no code.
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ConfirmButton
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This extender adds a confirm dialog to any Button, LinkButton, or ImageButton control.
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DragPanel
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Makes any panel into an object that you can drag around the page.
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DropDown
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This extender can wrap any control to provide a SharePoint-style drop-down menu that is attached to the control.
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DropShadow
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This extender adds attractive drop shadows to any control on the page
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DynamicPopulate
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Replace the contents of a page element with the result of a web-service call.
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FilteredTextBox
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Restrict the types of input that text boxes will accept.
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HoverMenu
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Allows UI to pop up next to a control when the mouse hovers over it.
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ModalPopup
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Allows you to show styled modal UI without using HTML dialogs.
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MutuallyExlcusiveCheckBox
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By adding a number of checkboxes to the same “Key”, only one checkbox with the specified key can be checked at a time.
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NoBot
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Applies simple rules to prevent automated bots or scripts from posting to a page.
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NumericUpDown
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Allow users to easily increase and decrease values using the mouse to scroll through values.
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PagingBulletedList
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Add paging and sorting to long bulleted lists.
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PasswordStrength
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Give your users visual cues to help them create secure passwords.
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PopupControl
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This extender turns any panel into a popup.
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Rating
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Let your users easily give feedback by rating content with this easy-to-use control.
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ReorderList
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This control is a full-featured data-bound control that allows its elements to be reordered on the client via drag and drop.
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ResizableControl
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Allow users to dynamically resize content, right in the browser
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RoundedCorners
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Rounds the corners of any control for a clean, professional look!
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Slider
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Adds an elegant scrollbar-like user interface for setting numeric values.
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TextBoxWatermark
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This extender adds "watermark" prompt text to TextBoxes on the page.
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ToggleButton
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This extender turns an ASP.NET CheckBox into an image checkbox.
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UpdatePanelAnimation
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Animates page elements corresponding to hidden postback activity.
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ValidatorCallout
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This extender enhances the functionality of existing ASP.NET validators.
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三．在Visual Studio.NET 2005開發基於ASP.NET AJAX的應用
安裝完ASP.NET AJAX後，打開Visual Studio.NET 2005中新建Web Site，在項目模板中會出現一項ASP.NET AJAX-enabled Web site，直接選擇它就可以了，如下圖：
新建完成的項目中會自動在Web.config中做好相關的配置，並且AJAXExtensionToolbox.dll已經添加到了VS的工具箱中，不需要再手工添加。
概述篇簡單的介紹這裏，從下一篇開始學習ASP.NET AJAX中的每一項具體的功能。
下篇預告：ASP.NET AJAX入門系列（2）：使用ScriptManager