Implementing Class Library Object

Author : Exforsys Inc. Published on: 5th Jun 2005 | Last Updated on: 24th Dec 2007

Implementing Class Library Object in VB.NET 2005

Class: Classical Object Oriented Concepts explain a class as a cookie cutter. A class allows you to create objects of the class. As a programmer you define a class with data fields, properties, methods and events. Then you can create objects based on that class that have state (fields, properties) and behavior (methods, events). A class can be considered as a specification of how the object of the class should look like and behave.

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An object of the class is nothing other than a sequence of bytes at a specific memory location in the memory heap. Thus we can understand that an object is an instance of the class. We can see an illustration of a class.

Let's see an illustration of a class

Public Class Class1

Private VehicleType As String

Private VehicleModel As String

Private VehicleColor As String

Public Sub Accelerate()

' add code to Accelerate

End Sub

ReadOnly Property engineCapacity() As Decimal

Get

Return engineCapacity

End Get

End Property

End Class

Creating a Class Library project

On the File menu, select New Project.
On the Templates pane, in the New Project dialog box, click Class Library.
In the Name box, type DemoClass1 and then click OK.
A new Class Library project opens, and the Code Editor displays the Class module Class1.vb.
In the Solution Explorer, right-click Class1.vb and select Rename, and then change the name to DemoClass1.vb.
Note that the name in the Code Editor also changed to DemoClass.vb.
On the File menu, select Save All.
In the Save Project dialog box, click Save

Let us see the screen shots for doing this exercise:

Opening the new project: