23 Program to use class in Form Based Program in VB.NET

In this program we are finding volume using a class.

Code:

Public Class Form1
    Public Class Box1
        Public l, b, h, vol As Integer
        Sub display()
            l = Form1.TextBox1.Text
            b = Form1.TextBox2.Text
            h = Form1.TextBox3.Text

            vol = l * b * h
            MsgBox("Volume" & vol)
        End Sub


    End Class

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim s As New Box1
        s.display()
End Sub


End Class

Output:  

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