Download Practical Standards for Microsoft Visual Basic.NET by Foxall J. PDF

By Foxall J.

Readers research most sensible practices for object-oriented programming, dossier operations, resolution distribution, and extra - with code samples and suggestion on employing criteria to their very own initiatives.

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For instance, when manipulating images, you often have a source image and a destination image. You might also have variables that keep track of the first and last items in a set. In such situations, you should use a standard qualifier at the end of the variable name. By placing the qualifier at the end, you create more uniform variables that are easier to understand and easier to search for. For example, use strCustomerFirst and strCustomerLast instead of strFirstCustomer and strLastCustomer. Table 5-1 describes common variable qualifiers.

06) / 12 Named constants: decInterestAmount = _ CDec((decLoanAmount * c_sngInterestRate) / c_intMonthsInTerm) One last note on constants: it's quite acceptable to give constants higher scope, unlike when you use variables, where it's highly advisable to reduce scope. As a matter of fact, you should never create the same constant twice within an application. If you find that you're duplicating a constant, move the original declaration to a higher scope until the constant becomes available to all procedures that need it.

When a parameter is declared as an enumerated type, it's really a long integer with a fancy IntelliSense drop-down list. While other developers should use the named enumeration members, they are free to pass the parameter any valid long integer. There are essentially two methods you can use to validate the data: • If the values fall within a range (such as 1 to 10), use an If End If construct to validate the data. • If the values form a discrete set that doesn't fit nicely in a range, use a Select Case construct.

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