Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.Button2 = New System.Windows.Forms.Button()
        Me.Button3 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(24, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(80, 32)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Button1"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(24, 56)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(80, 32)
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "Button2"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(24, 96)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(80, 32)
        Me.Button3.TabIndex = 2
        Me.Button3.Text = "Button3"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(128, 149)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button3, Me.Button2, Me.Button1})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' calculate the area of a circle with radius 100...
        Dim area As Double
        area = CalculateAreaFromRadius(100)

        ' print the results...
        MessageBox.Show(area, "Area")

    End Sub

    Sub SayHello()

        ' display a message box...
        MessageBox.Show("I have changed!", "Three Buttons")

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        ' call our function...
        SayHello()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        ' call our function...
        SayHello()

    End Sub

    ' CalculateAreaFromRadius - find the area of a circle...
    Function CalculateAreaFromRadius(ByVal radius As Double) As Double

        ' square the radius...
        Dim radiusSquared As Double
        radiusSquared = radius * radius

        ' multiply it by pi...
        Dim result As Double
        result = radiusSquared * Math.PI

        ' return the result...
        Return result

    End Function


End Class
