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  1. Table of contents
  2. An Introduction to Object-Oriented Programming with Visual Basic .NET | SpringerLink
  3. Object-Oriented Programming in VB .NET Learning Guide

Inheritance is a feature of object-oriented programming that allows code reusability when a class includes property of another class. Considering HumanBeing a class, which has properties like hands, legs, eyes, mouth, etc, and functions like walk, talk, eat, see etc. Man and Woman are also classes, but most of the properties and functions are included in HumanBeing. Hence, they can inherit everything from class HumanBeing using the concept of Inheritance. Here is a code example:. We are the forms of these classes. We have a physical existence while a class is just a logical definition.

We are the objects. The syntax for creating an object of a class Man:. Abstraction means, showcasing only the required things to the outside world while hiding the details. Encapsulation means that we want to hide unnecessary details from the user. For example, when we call from our mobile phone, we select the number and press call button. But the entire process of calling or what happens from the moment we press or touch the call button to the moment we start having a phone conversation is hidden from us.

Polymorphism is a concept, which allows us to redefine the way something works, by either changing how it is done or by changing the parts used to get it done. This can be done in two ways, overloading and overriding. If we walk using our hands, and not legs, here we will change the parts used to perform something.

Hence this is called Overloading. And if there is a defined way of walking, but I wish to walk differently, but using my legs, like everyone else. Then I can walk like I want, this will be called as Overriding. Read the Noteworthy in Tech newsletter. Sign in. Get started. Yann Mulonda Follow. OOP Concepts. Noteworthy - The Journal Blog Follow. The Official Journal Blog.

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See responses You can disable the execution of the Finalize method by calling the SuppressFinalize method on the GC object, as shown in the following example. This method accepts a single argument that is a reference to the object that should not have its Finalize method called. NET, this is done with the Me keyword. In the following example, if the client code called the Dispose method directly, the connection would be closed and the Finalize method would not be called by garbage collection.

If the client did not call the Dispose method, the Finalize method will still execute when garbage collection destroys the object. Lead-in This demonstration will show you how to define classes and instantiate and destroy objects. In this demonstration, you will learn how to define a simple class that uses Delivery Tip multiple constructors. You will also learn how to instantiate and use the class The step-by-step from within client code.

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NET Lab 5. Lead-in In this lab, you will define the Customer class for the Cargo system. Explain the lab objectives. Objectives After completing this lab, you will be able to: n Create classes. Prerequisites Before working on this lab, you should be familiar with creating classes in Visual Basic. Scenario In this lab, you will begin creating the Cargo system. You will create the Customer class and a test application to instantiate, initialize, and test the class.

Starter and Solution Files There are starter and solution files associated with this lab. The starter project contains several forms that you will use to test your Customer class. Open Visual Studio. On the File menu, point to Open, and then click Project. On the Project menu, click Add Class. In the Add New Item dialog box, change the name of the class file to Customer.

Add the following private variables to the class definition. Add the following public properties, and use these to access the private variables created in the previous step. Save the project. Add the following methods to the class definition. On the File menu, point to Open, and click File.

Visual Basic Tutorial - Object Oriented Programming

In the Files of type list, click Text Files. Click Code. Locate the LogOn code in Code. Copy the procedure code to the LogOn method of the Customer class.

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  7. Locate the AddCustomer code in Code. Copy the procedure code to the AddCustomer method of the Customer class. In the Customer class, locate the default constructor definition the Su b Ne w without parameters , and initialize the intCustomerID variable to Locate the alternative constructor code in Code.


    An Introduction to Object-Oriented Programming with Visual Basic .NET | SpringerLink

    Copy the procedure code to the parameterized constructor of the Customer class. Declare and instantiate a Customer variable called cusCustomer. Call the LogOn method of the cusCustomer object, passing in the text properties of txtEmail and txtPassword as parameters. Display the properties of the cusCustomer object in the appropriate text boxes. Set cusCustomer to Nothing. On the Debug menu, click Start. Text box Value E-mail karen wingtiptoys.

    Click the Logon button, and step through the procedure. Confirm that your code retrieves the customer information and displays it correctly in the text boxes. Close the form. Reopen the LogOn form and enter the following incorrect values in the appropriate text boxes.

    Textbox Value E-mail john tailspintoys. Confirm that your code causes an exception to be generated and handled by the form. Click the Close button to quit the application. NET 29 Exercise 3 Testing Customer Retrieval In this exercise, you will test the parameterized constructor that retrieves the customer details from a simple form. Use the parameterized constructor to pass in the existing customer ID from the txtID text box.

    Use the CInt function to convert it to an integer value. Click the Retrieve button, and step through the procedure. Click the Clear Data button to reset the information, and type the value in the CustomerID text box. Call the AddCustomer function of the cusCustomer object, passing in the appropriate values and displaying the return value in a message box. Use the CStr function to convert the integer value to a string. Use the information in the following table: Parameter name Value strEmail txtEmail.

    Object-Oriented Programming in VB .NET Learning Guide

    Text strPassword txtPassword. Text strFName txtFName. Text strLName txtLName. Text strCompany txtCompany. Text strAddress txtAddress. Text 4. Enter values in all text boxes. Click the New Customer button, and step through the procedure. Confirm that your code passes the information to the procedure correctly, and that a new ID is returned.

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    Click the Close button and quit the application. Lead-in In this lesson, you will learn n Overriding and Overloading about inheritance. After Delivery Tip completing this lesson, you will be able to: Inform students that although inheritance is an n Inherit from an existing class.

    NET, you can n Override and overload some base class methods in a derived class. NET , you can use inheritance to derive a class from an existing base class. The derived class can inherit all the base class properties, methods, Delivery Tip data members, events, and event handlers, making it easy to reuse the base class Point out that inheritance code throughout an application. However, The Inherits Keyword many applications do not need inheritance and can The following example shows how to use the Inherits keyword to define a perform perfectly well derived class that will inherit from an existing base class: without it.

    Make clear that if Pu b l i c Cl a s s De r i v e d Cl a s s inheritance is used, students should not create complex I n h e r i t s Ba s e Cl a s s hierarchies that will become End Cl a s s The NotInheritable Keyword The following example shows how to use the NotInheritable keyword to define a class that cannot be used as a base class for inheritance. A compiler error is generated if another class attempts to inherit from this class.