1
2	Localize Web Apps Quickly and Easily Browsers transmit Accept-Language headers identifying language preferences You can use this information to localize output from FCL methods called by ASP.NET apps Application_BeginRequest Thread.CurrentCulture CultureInfo
3	Global.asax
4	Use Custom HTTP Handlers to Extend ASP.NET HTTP handlers are classes that handle HTTP requests Mapped to file names and file name extensions in CONFIG files Implement IHttpHandler Built-in handlers handle requests for ASPX files, ASMX files, and other ASP.NET file types Custom HTTP handlers respond to requests in any way you want Generate images from user input (e.g., graphs) Convert XML to HTML using XSLT
5	Hello.ashx
6	Invoking Hello.ashx
7	ASHX Image Generator Template
8	Image Generator Template, Cont.
9	Use the Application Cache to Write Apps that Scream Common performance bottlenecks in Web apps: File accesses Database accesses ASP.NET application cache provides a fast and easy-to-use means for caching data (any data) to minimize I/O Can hold anything derived from System.Object Supports expiration policies and dependencies Optionally notifies you when an item is removed A key to great performance!
10	Using the Application Cache
11	Temporal Expiration (Absolute)
12	Temporal Expiration (Sliding)
13	File Dependency Expiration
14	Cache Removal Callbacks
15	Cache Removal Callbacks, Cont.
16	Use the Page Output Cache to Intensify the Screaming Fetching an ASPX Web page incurs overhead ASP.NET page output cache reduces overhead by caching output from pages You control cache duration You control other caching parameters, too Caching can be performed at two levels: Page level (ASPX files) Sub-page level (ASCX files)
17	Page Caching
18	The VaryByParam Attribute To cache different versions of a page based on the value of an input parameter, identify the parameter with VaryByParam Separate multiple parameters with semicolons Use * to represent any input parameter
19	Sub-Page (Fragment) Caching
20	The VaryByControl Attribute To cache different versions of a user control based on the value of a property, identify the property with VaryByControl Separate multiple properties with semicolons Use * to represent any property
21	Use Application_Error to Trap Unhandled Exceptions Fired when unhandled exceptions occur Process them in Global.asax and let someone know that the application is sick Should be considered de rigueur in ASP.NET apps!
22	Example 1 Record error in system event log
23	Example 2 E-mail a system administrator
24	Use ItemCreated Events to Customize DataGrids DataGrid controls are highly customizable Public properties Custom columns (including TemplateColumns) ItemCreated events ItemCreated events are the key to advanced DataGrid customizations Fired for each row rendered by a DataGrid Use them to customize a DataGrid’s HTML output Use them to inject client-side script
25	Rainbow DataGrid
26	Rainbow DataGrid, Cont.
27	Rainbow DataGrid - The Output
28	Eliminate Unnecessary View State Many ASP.NET server controls use view state to persist state from one request to the next TextBox, ListBox, and so on View state is round-tripped in __VIEWSTATE controls View state often isn’t necessary Used to fire change events Used to preserve state in controls whose state isn't fully encapsulated in postback data Disable view state when it isn’t needed Reduces the data passed in each request Increases performance
29	This is Wasteful
30	This is Not
31	The Difference Without EnableViewState=“false” With EnableViewState=“false”
32	Use EnableViewStateMac to Prevent View State Tampering By default, ASP.NET doesn’t verify that view state round-tripped to the client and back isn’t altered Leaves open the possibility of tampering Use EnableViewStateMac to prevent tampering For an individual page For all pages
33	Use Derivation to Modify ASP.NET Web Controls Derive from Control or WebControl to create “from-scratch” custom controls Derive from existing control classes to leverage functionality already built in Override inherited methods and properties as needed (especially the Render method) Add new methods and properties, too
34	NumTextBox Control
35	NumTextBox Control, Cont.
36	Use WinForms Controls to Build Rich Browser UIs HTML is a limited medium for expressing UIs Browser-based UIs can be made richer with client-side script, but even that only goes so far Use Windows Forms controls in Web pages to build ultra-rich browser-based UIs Requires .NET Framework on the client Requires IE 5.01 or higher For a cool sample, see http://www.wintellect.com/resources/faqs/-default.asp?faq_id=1&page=5
37	WebSlider Control
38	Using the WebSlider Control