By Tony Gaddis, Kip R. Irvine
Within the Fifth version, Advanced visible simple 2010 is helping people who are acquainted with the basics of visible simple 2010 programming harness its strength for extra complex makes use of. insurance of refined instruments and strategies utilized in the this day comprise a number of database, ASP.NET, LINQ, WPF and internet prone issues. After learning the e-book and finishing the programming routines, scholars could be in a position to create small- to medium-sized home windows and net purposes that use databases. they're going to additionally achieve crucial strategies in object-oriented programming, event-driven programming, and test-driven improvement. every one topic is gifted in an comprehensible sort that makes this e-book a pacesetter within the box.
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Extra resources for Advanced Visual Basic 2010 (5th Edition)
Enabled = False End Sub Step 11: Add the following Click handler for the Deposit button. Show(''Please enter a numeric deposit amount'', ''Error'') End Try End Sub Step 12: Add the following Click handler for the Withdraw button. Show(''Please enter a numeric withdrawal" _ & " amount", "Error") 11: End Try 12: End Sub This code must deal with two kinds of errors. If the user enters a nonnumeric value, line 4 throws an exception and line 10 reminds the user to enter a numeric value. Or, if the user tries to withdraw more than the account balance, line 7 displays the error message stored in the LastError property.
The principle of information hiding says that most variables and even some methods must be hidden inside classes. The hidden variables and methods can be accessed only by other methods in the same class. • Creating an instance of a class is a two-step process. First, declare an object variable; then create an instance of the class and assign it to the variable. • A property procedure is a class member that defines a property. It has two sections: Get and Set. The Get section holds the code that is executed when the property value is retrieved, and the Set section holds the code that is executed when a value is stored in the property.
Figure 1-12 AccountType Enum Example program Step 1: Open the AccountType Enum Example project in the example program’s folder for this chapter. Message 29: End Try 30: End Sub 31: End Class Line 2 declares a string array containing the AccountType member names. Line 6 assigns this array to the list box when the form first loads. When the user makes a selection, the SelectedIndexChanged handler (lines 22–30) executes. The index of the selected item is cast into an AccountType object on line 26 and passed to the ShowDescription method (lines 9–20).
Advanced Visual Basic 2010 (5th Edition) by Tony Gaddis, Kip R. Irvine