winforms data matrix reader

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winforms data matrix reader

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This chapter covers built-in data-caching features in ASP .NET . Caching is a long-standing means of improving the performance of any software system . The idea is to place frequently used data in quickly accessed media . Even though access times for mass storage continue to improve, accessing data from a standard hard disk is much slower than accessing it in memory . By taking often-used data and making it available quickly, you can improve the performance of your application dramatically . The ASP .NET runtime includes a dictionary (key/value map) of Common Language Runtime (CLR) objects . The Cache lives with the application and is available through the HttpContext and System.Web.UI.Page . Using the cache is very much like using the Session object . You can access items in the cache using an indexer . In addition, you can control the lifetime of objects in the cache and even set up links between the cached objects and their physical data sources . This chapter starts by examining a case in which using the cache is justified .

Part III:

find handy when following the verbal description of the algorithm . The following code implements this algorithm:

5

2

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A common low-level design decision is the choice of whether to compute results on the fly or compute them once, save them, and look them up as needed. If the results are used many times, it s often cheaper to compute them once and look them up the rest of the time. This choice manifests itself in several ways. At the simplest level, you might compute part of an expression outside a loop rather than inside. An example of this appeared earlier in the chapter. At a more complicated level, you might compute a lookup table once when program execution begins, using it every time thereafter, or you might store results in a data file or embed them in a program. In a space-wars video game, for example, the programmers initially computed gravity coefficients for different distances from the sun. The computation for the gravity coefficients was expensive and affected performance. The program recognized relatively few distinct distances from the sun, however, so the programmers were able to precompute the gravity coefficients and store them in a 10-element array. The array lookup was much faster than the expensive computation. Suppose you have a routine that computes payment amounts on automobile loans. The code for such a routine would look like this:

year) Error Msg. Day maximum +1 (non-leap year) Error Msg. Year minimum -1 Next date Year minimum Next date Year minimum +1 Next date Year maximum -1 Next date Year maximum Error Msg. Year maximum +1 Error Msg. Output minimum -1 1/2/1582 3/3/1582 Output minimum Output minimum +1

Connectivity is ubiquitous. Most computers are not only connected to an internal business network, but they are also connected to the Internet. High-speed wireless networks and mobile users are everywhere, often exposed directly to the Internet with its vast botnets hosting all sorts of viral malware and spewing measureless floods of spam. Even servers sitting on managed corporate networks face risks from returning travelers who plug in their laptops that became infected while on the road; from visiting consultants and customers who ask to share your network; and of course from malicious insiders who for whatever reason believe it is in their best interests to exploit your business systems. For these reasons it makes sense to consider using the host firewall included with Windows Server 2008 to provide another layer of protection in your defense-in-depth architecture. Windows Firewall with Advanced Security provides bidirectional filtering to help keep unwanted traffic from getting to the services running on the system, and to prevent compromised servers from assaulting the rest of your network. Management of the Windows Firewall and Internet Protocol Security (IPsec) is integrated into a single Microsoft Management Console (MMC) console so that the firewall becomes the cornerstone of your network s isolation strategy.

The core thesis of structured programming is that any control flow whatsoever can be created from these three constructs of sequence, selection, and iteration (B hm Jacopini 1966). Programmers sometimes favor language structures that increase convenience, but programming seems to have advanced largely by restricting what we are allowed to do with our programming languages. Prior to structured programming, use of gotos provided the ultimate in control-flow convenience, but code written that way turned out to be incomprehensible and unmaintainable. My belief is that use of any control structure other than the three standard structured programming constructs that is, the use of break, continue, return, throw-catch, and so on should be viewed with a critical eye.

method was specified, the context object will be passed back to the view model. This allows any changes that the user made during the interaction to be passed back to the view model. The following code shows how an interaction request is initiated.

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