vb.net ean 128 reader

vb.net ean 128 reader

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Alt hough t he On Er ror GoTo st at em ent is fam iliar from ear lier versions of Visual Basic and st ill available in Visual Basic NET, I r ecom m end t hat y ou m igrat e away from it in y our new applicat ion developm ent effort s The GoTo st at em ent leads t o unst r uct ured ( spaghet t i ) code This code design st yle is w idely recognized t o be difficult t o debug and m aint ain I n addit ion, you can hav e only one act iv e On Er ror GoTo st at em ent at a t im e You can nest m ult iple Try Cat ch Finally st at em ent s w it hin one anot her.

Finally, I leav e you wit h t wo part ing r ecom m endat ions First , replace t he built - in error m essages wit h cust om ones t hat m ax im ize t he am ount of cont ext ual help your applicat ions get Second, t ry t o fix pr oblem s rat her t han j ust let a user k now t hat a problem ex ist s For exam ple, if y our applicat ion cannot connect t o a dat abase serv er , at t em pt t o connect t o a backup dat abase serv er w hen one is available..

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Automatic System Recovery (ASR) is a system recovery utility included in Windows Server 2003. By using this utility, you can rebuild a failed server without having to reinstall the operating system. ASR works like this: When you run the Backup utility and select ASR, it creates a snapshot of the server and its configuration, which includes the operating system, its components, and their configurations, as well as dynamic volume settings for partitioning and fault tolerance. If the server fails, you can restore it to the same machine or another machine with the exact same system configuration as the original machine. Because of the way the snapshot is applied, you need not reinstall the operating system or reconfigure components prior to running the utility. You simply boot the server to the Windows Server 2003 installation CD-ROM and choose to do a system recovery.

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We ve already talked about plan reuse and how SQL Server nds a plan in cache. In this section, we look at how SQL Server manages the size of plan cache and how it determines which plans to remove if there is no room left in cache. Earlier, I discussed a few situations in which plans would be removed from cache. These situations included global operations like running DBCC FREEPROCCACHE to clear all plans from cache, as well as changes to a single procedure, such as ALTER PROCEDURE, which would drop all plans for that procedure from cache. In most other situations, plans are removed from cache only when memory pressure is detected. The algorithm that SQL Server uses to determine when and how plans should be removed from cache is called the eviction policy. Each cache store can have its own eviction policy, but we are discussing only the policies for the Object Plan store and the SQL Plan store. Determining which plans to evict is based on the cost of the plan, which is discussed in the next section. When eviction starts is based on memory pressure. When SQL Server detects

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This chapter completes the discussion of ASP.NET applications and their advanced fea tures, such as session state, caching, and security. But I have yet to cover one ASP.NET related topic: user controls. This is what the next chapter is all about.

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