Murach's Visual Basic 2010 by Anne Boehm

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By Anne Boehm

Even if you're new to visible easy or you're upgrading to VB 2010 from an prior model, this new version of Murach's middle VB e-book exhibits you the way to enhance the type of bullet-proof home windows varieties purposes that companies depend upon. alongside the best way, you'll the way to fast construct database purposes through the use of RAD beneficial properties like facts assets and the DataGridView keep an eye on. You'll how one can use object-oriented beneficial properties like inheritance and interfaces in addition to 2010 beneficial properties like auto-implemented homes and assortment initializers. You'll the right way to use LINQ to question info and XML to switch facts among functions. You'll the way to make the most of the entire productiveness gains of visible Studio 2010. in case you re performed, you'll have the ability to improve home windows kinds functions the way in which the simplest execs boost them. That's why we are saying: No different publication teaches you rather a lot, so speedy, or so completely.

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Magic Numbers Are Prone to Data Entry Problems One of the critical problems with magic numbers is that you can easily mistype a number, transposing its digits. When you type the number 10876, for instance, it's not at all difficult to mistakenly type 10867 or 18076. In contrast to the way it handles variables and reserved words, Microsoft Visual Basic's compiler takes no issue with transposed or incorrect numbers—it's happy to use whatever magic number you supply it. Sometimes the problems caused by a simple mistake don't surface immediately, and when they do they can appear as random miscalculations that are difficult to pinpoint.

System constants are global constants that are part of the Visual Basic type library. You don't have to define them or reference a library to use them because they're always available. However, since system constants don't appear in the code helper drop-down list, as enumerations do, many developers are unaware that these constants exist. Whenever you must type a numeric value as a parameter of a Visual Basic function or as the value of a standard Visual Basic object property, chances are good there's an associated system constant.

Incorrect: '* Fill a most recently used list. For intCount = 1 To 4 strFileName = RetrieveRecentFileName(intCount) '* If an entry was found, add it to the list. SmallIcon = "Database" End If Next intCount Correct: '* Fill a most recently used list. Const c_Max_Recently_Used = 4 For intCount = 1 To c_Max_Recently_Used strFileName = RetrieveRecentFileName(intCount) '* If an entry was found, add it to the list. 3 Use enumerations whenever they are available. When a procedure or a parameter is declared as an enumerated type, it's common courtesy—nay, it's your duty—to reference the enumeration member names rather than their values.

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