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<! File: PiPageaspx > <%@ Page : Addison Wesley%> language=C# Publisher <html> Pub Date : February 11, 2003 <head> ISBN : 0-201-76040-1 <script runat=server> Pages 432 protected: void Page_Load(Object src, EventArgs e) { if (Cache["pi"] == null) { "This well-conceived pi in app // Refresh and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and piText = architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom ((global_asax)ContextApplicationInstance)LoadPi(); } Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through else version 11 It provides experienced programmers with the information needed to fully understand the piText = (string)Cache["pi"]; technology, and is a clear guide to using ASPNET to build robust and well architected Web applications } </script> This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how </head>
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it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the <body> data binding model, and custom control development Throughout the book, working examples illustrate <form runat="server"> best practices Page</h1> Web-based applications in C# <h1>The pi for building Among the topics explored in depth are:
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<asp:TextBox id="pi" runat=server Rows=50 Wrap=True Width=450px TextMode=MultiLine Height=300px/> </form> ASPNET architecture </body> </html> forms Web
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An object in the data cache can be removed in several ways You can explicitly remove it from the cache Diagnostics and error handling using the CacheRemove method, it can be removed because its lifetime has expired, or it can be implicitly removed from the cache to reduce memory consumption (scavenging) You have direct control over the first Validation two cases You explicitly call CacheRemove, and you explicitly set the expiration date of items in the cache Removal because of scavenging, however, is not always under your direct control You can indicate a Data binding preference for how your cache items should be treated during a scavenging operation, however Custom controls When scavenging is performed, the data cache removes items with low priority first By default, your cache items Caching have normal priority If you want to directly control the priority of your cache items, you can set the priority value when you perform the insertion into the cache Table 9-5 shows the various values for State management CacheItemPriority and their meanings Note that you can request that an item in the cache not be removed during scavenging Most of the time, it is wise to leave these priority values at their defaults and
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Description Itemless likely than Normal items to be removed from cache during scavenging Itemmore likely than Normal items to be removed from cache during scavenging Equivalent to Normal Least likely to be deleted from the cache during scavenging Deleted from the cache after all Low and BelowNormal items have been deleted during scavenging Never removed from the cache implicitly
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ByFritz Onion Publisher Pub Date ISBN : Addison Wesley
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NotRemovable
: February 11, 2003
: 0-201-76040-1 933 Pages Data Cache Considerations and Guidelines : 432
As with the output cache, using the data cache effectively involves making important decisions about data lifetime and estimating trade-offs in memory consumption and throughput The following guidelines and considerations are designed to help you use the data cache as efficiently priceless experience overflowing "This well-conceived and well-written book has extensive knowledge and as possible
from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom 1 The data cache is not a container for shared updateable state Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through You should always anticipate the possibility that a request for an item in the data cache will return version 11 It provides experienced programmers with the information needed to fully understand the null, and you should never modify existing items (although replacing them with new objects is fine) technology, and is a clear guide to using ASPNET to build robust and well architected Web applications The data cache does protect against concurrent writes to the Hashtable that is used internally to store cache entries, but that concurrency protection does not extend to accessing and modifying This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how objects in the cache In general, it is a bad idea to use any shared updateable state at the application it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, scope anyway, because it often can become a bottleneck in application performance including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate 2 Cache data that is accessed frequently and is relatively expensive to acquire best practices for building Web-based applications in C#
The effectiveness of caching data in a Web application depends on two factors: how often the data is Among the topics explored in depth are: accessed and how often it changes As with output caching, if the data changes with each client request, caching it is a complete waste of resources On the other hand, if the data does not change frequently but is almost never accessed, it is also a waste of resources to cache it (especially if it is ASPNET architecture big) Caching data retrieved from a database, especially if the database is on a remote machine, is almost always beneficial Web forms 3 Configuration If data is dependent on a file, directory, or other cache entry, use a CacheDependencyto be sure it remains current HTTP pipeline Many cache entries may have dependencies on external resources, or perhaps other cache entries It is easy to ensure that these entries stay current by adding a CacheDependency when inserting them Diagnostics and error handling into the cache Note that you can also signal that a cache entry is out of sync with a database value by Validation adding a trigger to the database that modifies a file whenever the data is changed 4 Data binding coherency problems Beware cache
Custom controls performance improvement that data caching brings, it is easy to begin relying on it With the dramatic too much and introducing cache coherency problems into your system When you add data to the Caching cache, carefully think through the different ways in which it will be accessed, and make sure that the data is not stale or that stale data is acceptable In most cases, you can still achieve significant State management performance improvements even with short cache lifetime durations, especially if the data is accessed frequently
[ Team LiB ]