Download e-book for kindle: Advanced Visual Basic 2010 (5th Edition) by Tony Gaddis, Kip R. Irvine

By Tony Gaddis, Kip R. Irvine

ISBN-10: 0132316749

ISBN-13: 9780132316743

Within the Fifth variation, Advanced visible simple 2010 is helping people who find themselves acquainted with the basics of visible uncomplicated 2010 programming harness its strength for extra complicated makes use of. insurance of refined instruments and methods utilized in the this day comprise a variety of database, ASP.NET, LINQ, WPF and net providers themes. After learning the booklet and finishing the programming routines, scholars could be capable of create small- to medium-sized home windows and internet purposes that use databases. they'll additionally achieve crucial options in object-oriented programming, event-driven programming, and test-driven improvement. each one topic is gifted in an comprehensible kind that makes this ebook a pace-setter within the box.

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When selecting inputs, we use values that should produce specific results. In the following table, the prompts to the user indicate valid ranges for the inputs. We begin by hand-calculating reasonable inputs and expected outputs for the testing plan. 00 You should also test the application with invalid inputs to make sure the correct error messages are generated. In our current example, inputs might be blank, nonnumeric, or out of range. Of course, the program must not throw an unhandled exception.

You may recall that the GetUpperBound function returns the highest permissible subscript for a given array. In the OK button’s Click handler, line 13 uses TryParse to convert the text box to an integer. If it fails, line 22 displays an error message. Line 14 checks colorIndex against a range of acceptable values. If colorIndex is within a valid range, line 19 uses colorIndex as a subscript into the colors array, to get the name of the color, as a string. The requirements specification provides the basic structure of our testing plan because it mentions error handling for user input.

LastError holds a string that contains the most recently generated error message by methods in this class. 0D End Sub 31 32 Chapter 1 Classes Step 7: Insert the GetData method, which reads the data file and attempts to find a data set containing a certain account ID. Close() 22: End Try 23: Return False 24: End Function Line 5 opens the input file, using the file name and path in the FilePath property. If the file is found, OpenText returns a StreamReader that can be used to read all data from the file.

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Advanced Visual Basic 2010 (5th Edition) by Tony Gaddis, Kip R. Irvine

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