System 1 0 St ream provides Beg i n Re a d and BeginWrite APM in Visual Studio .NET

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methods A default implementation is provided on the Stream base type so that all of the subclasses in the NET Framework get Beg i n Read and BeginWri te methods for free Stream uses the asynchronous delegate functionality mentioned above Most streams, notably F i leSt ream, override the default behavior to implement more efficient asynchronous operations relying on native Windows asynchronous I / O
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The System Net S o c k et s Soc ket class offers a big array of APM methods: BeginAc c e pt , Beg i n Co n n e c t , Beg i n D i s c o n n e c t , Begi n
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R e c e i v e , Beg i n Re c e i v e F rom , Beg i n R e c e iveMe s s a g e F rom , Begi n S e n d , Beg i n S e n d F i le, and Beg i n S e n dTo Most of these methods take
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full advantage of the capability Windows provides for network I / O to truly happen asynchronously
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As of the NET Framework 20, the System Data S q l C l i e nt S q lCom ma n d type offers APM versions of its primary execution methods:
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Beg i n E x e c uteNonQu e ry , Begi n E xec u t e R e a d e r, and Beg i n E x e c u teXm l R e a d e r
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All System Net We bRe q u e st subclasses support the Beg i n Get
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R e q u e stSt ream and B e g i n G et Re s po n s e methods The base class itself throws a N ot l m p l emented E x c e p ti o n, but the three subclasses, F i leWe b Req u e s t , F t pwe b R e q u e st, and HttpWe b R e q u e st, provide
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actual implementations
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DNS resolution through the System Net Dn s class can be done asynchronously with the Begi nGetHostAd d r e s s e s , Beg i n GetHost
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ByName , Begi nGetHost E n t ry, and B e g i n R e s o l v e APM methods System T r a n s a ct i o n s Committ a b l e T ra n s a ct io n provides
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asynchronous commit operations with the Beg i n Comm i t and E n dCommi t methods In addition to all of those libraries, there are areas of the platform that interoperate with the APM in useful ways One prime example is the ASPNET asynchronous pages feature
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ASP N ET Asynchronous Pages ASPNET 20' s asynchronous pages feature is an interesting case study of how the APM can be used in practice It's widely recognized as a bad practice to block on a busy server because doing so adds some amount of overhead: a single blocked thread means other requests cannot be serviced, possibly leading to a pileup of them The thread pool may react by injecting addi tional threads, also impacting performance Nonblocking designs-using asynchronous file I / O, and the like-lead to better throughput because threads can continue to process requests while I / O (or other asynchronous work) happens "in the background " The asynchronous pages capability allows you to register a pair of Beg i n F oo/ E n d F oo methods that execute as a page is being rendered Instead of keeping a thread blocked while the work executes, ASPNET will let the rendering thread go back to the pool to work on additional requests Only once the asynchronous work is done will ASPNET then call the E n d F oo method to retrieve results and then continue rendering the page with said results in hand Everything ASPNET 20 does to allow the asynchronous pages feature could have been written in ASPNET 1 0 and 1 1 , but the features were not nearly as easy to access Now if you mark your page as Asyn c = " T r u e " , ASPNET implements IHtt pAsy n c H a n d l e r for you
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