Download e-book for kindle: Application Development Using Visual Basic® and .NET by Dana L. Wyatt

By Dana L. Wyatt

ISBN-10: 0130933821

ISBN-13: 9780130933829

This e-book provides skilled builders the sensible perception they should construct company purposes utilizing visible easy .NET. utilizing wide code examples and a working case examine, the authors light up the .NET thoughts and applied sciences that provide builders the best energy and cost. They hide the complete means of developing a .NET software: constructing an easy .NET console software; including a home windows types interface; separating performance inside parts; delivering database entry through ADO.NET; securing your code; and utilizing ASP.NET to create internet purposes and prone.

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Value types have storage allocated immediately on the stack when the variable is declared. Reference types have storage allocated on the heap when they are instantiated, not when they are just declared, and the variable is only a reference to the actual object containing the data.

In some languages, such as C++, where there can be global variables not attached to any class, you may initialize a library through the constructor for a global object. NET Language constructor. " This program displays the text Hello, World, proving that the shared constructor automatically executes first, displaying the text Hello, . Then later, the call to the World method displays the word World. World() End Sub End Module Constant and Read Only Fields If you want to make sure that a variable or field always has the same value, you can assign the value via an initializer and use the Const modifier.

CustomerId = 1 ' all fields have now been assigned TestCustomer\Step0 provides a simple test program to exercise the Customer class. Note that an unassigned field of a class receives a default value, such as 0, when an object is instantiated. Assigning Object References TestCustomer\Step1 provides a more complete test program to exercise the Customer class. Two object instances are created, an assignment is made of one object reference to another, and a field is assigned a value. EmailAddress) End Sub End Module Figure 3-9 shows the object references cust1 and cust2 and the data they refer to after the objects have been instantiated and the CustomerId field has been assigned.

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Application Development Using Visual Basic® and .NET by Dana L. Wyatt

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