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    If Any Web Resources Required.: Sub Dim As New

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    neer
    This document discusses a practical exercise on understanding classes and objects in VB.Net. It includes sample code that creates a Test class with a disp method, and creates an object of the Test class to call the method. It also includes sample code for a Box class that calculates volume, and asks exercises to create a program to calculate average from combo box values using a class.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    If Any Web Resources Required.: Sub Dim As New

    Uploaded by

    neer
    20 views3 pages
    This document discusses a practical exercise on understanding classes and objects in VB.Net. It includes sample code that creates a Test class with a disp method, and creates an object of the Test class to call the method. It also includes sample code for a Box class that calculates volume, and asks exercises to create a program to calculate average from combo box values using a class.

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    This document discusses a practical exercise on understanding classes and objects in VB.Net. It includes sample code that creates a Test class with a disp method, and creates an object of the Test class to call the method. It also includes sample code for a Box class that calculates volume, and asks exercises to create a program to calculate average from combo box values using a class.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    20 views3 pages

    If Any Web Resources Required.: Sub Dim As New

    Uploaded by

    neer
    This document discusses a practical exercise on understanding classes and objects in VB.Net. It includes sample code that creates a Test class with a disp method, and creates an object of the Test class to call the method. It also includes sample code for a Box class that calculates volume, and asks exercises to create a program to calculate average from combo box values using a class.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    Practical No. 17: Understand the Concept of Class and Object of Class.

    Practical No 17

    VIII. Resources required (Additional)


     If any web resources required.

    X. Resources used (Additional)


     https://docs.microsoft.com/en-us/dotnet/visual-basic/language-
    reference/statements/function-statement
     https://www.tutorialspoint.com/vb.net/vb.net_functions.htm

    XI. Program Code


    1. Write a program using the concept of class & object in VB.Net.
     Module Module1
    Sub Main()
    Dim obj As New Test 'creating a object obj for Test Class
    obj.disp() 'Calling the disp method using obj
    Console.ReadLine()
    End Sub
    End Module
    Public Class Test
    Sub disp()
    Console.WriteLine("Welcome to VB.NET")
    End Sub
    End Class

    XII. Results (output of the program)


    Welcome to VB.NET

    XIII. Practical related Questions


    1. Find output in following code.
     4

    2. Find Error in following code.


    Module Module1
    Sub Main()
    Dim b As B = New B(5)
    B = Display()

    Dim c As C = New C(5)


    B = Display()
    End Sub
     Compilation error (line 3, col 0): Type 'B' is not defined.
    Compilation error (line 4, col 0): 'Display' is not declared. It may be inaccessible due to its protectio
    n level.
    Compilation error (line 6, col 0): Type 'C' is not defined.
    Compilation error (line 7, col 0): 'Display' is not declared. It may be inaccessible due to its protectio
    n level.

    GUI Application Development using VB.Net (22034) Page 1


    Practical No. 17: Understand the Concept of Class and Object of Class.

    XIV. Exercise
    1. Write a program to identify Volume of Box Class, with three data members, length,
    breadth and height.
     Module Module1
    Sub Main()
    Dim obj As Box = New Box()
    Dim vol As Integer
    vol = obj.volume(2, 4, 4)
    Console.WriteLine("Length =" & obj.l)
    Console.WriteLine("Breadth =" & obj.b)
    Console.WriteLine("Height =" & obj.h)
    Console.WriteLine("Volume =" & vol)
    Console.ReadLine()
    End Sub
    Class Box
    Public l, b, h As Integer
    Function volume(ByVal i As Integer, ByVal j As Integer,
    _ByVal k As Integer)
    Dim v As Integer
    l = i
    b = j
    h = k
    v = l * b * h
    Return v
    End Function
    End Class
    End Module

    Output:

    2. Implement a program to accept values from Combo Box and Display average of this in
    message box using class.

    GUI Application Development using VB.Net (22034) Page 2


    Practical No. 17: Understand the Concept of Class and Object of Class.

    Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs)


    Handles MyBase.Load
    ComboBox1.Items.Add(5)
    ComboBox1.Items.Add(8)
    ComboBox1.Items.Add(12)
    ComboBox1.Items.Add(20)
    ComboBox1.Items.Add(32)

    ComboBox2.Items.Add(6)
    ComboBox2.Items.Add(11)
    ComboBox2.Items.Add(17)
    ComboBox2.Items.Add(24)
    ComboBox2.Items.Add(36)
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs)


    Handles Button1.Click
    Dim average As Single
    average = (Val(ComboBox1.Text) + Val(ComboBox2.Text)) / 2
    MsgBox("Average = " & average)
    End Sub
    End Class

    OUTPUT:

    GUI Application Development using VB.Net (22034) Page 3

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