Option Strict On
Option Explicit On 
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 Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents BtnExit As System.Windows.Forms.Button
    Friend WithEvents LblCommission As System.Windows.Forms.Label
    Friend WithEvents TxtSales As System.Windows.Forms.TextBox
    Friend WithEvents BtnCalculate As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.LblCommission = New System.Windows.Forms.Label
        Me.TxtSales = New System.Windows.Forms.TextBox
        Me.BtnCalculate = New System.Windows.Forms.Button
        Me.BtnExit = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.ImageAlign = System.Drawing.ContentAlignment.BottomCenter
        Me.Label1.Location = New System.Drawing.Point(24, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(120, 23)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Sales Amount -->"
        '
        'Label2
        '
        Me.Label2.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.ImageAlign = System.Drawing.ContentAlignment.BottomCenter
        Me.Label2.Location = New System.Drawing.Point(24, 64)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(120, 23)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "Commission   -->"
        '
        'LblCommission
        '
        Me.LblCommission.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.LblCommission.Location = New System.Drawing.Point(136, 64)
        Me.LblCommission.Name = "LblCommission"
        Me.LblCommission.Size = New System.Drawing.Size(112, 23)
        Me.LblCommission.TabIndex = 2
        '
        'TxtSales
        '
        Me.TxtSales.Location = New System.Drawing.Point(136, 24)
        Me.TxtSales.MaxLength = 16
        Me.TxtSales.Name = "TxtSales"
        Me.TxtSales.Size = New System.Drawing.Size(112, 20)
        Me.TxtSales.TabIndex = 3
        Me.TxtSales.Text = ""
        '
        'BtnCalculate
        '
        Me.BtnCalculate.Font = New System.Drawing.Font("Microsoft Sans Serif", 8.25!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnCalculate.Location = New System.Drawing.Point(264, 22)
        Me.BtnCalculate.Name = "BtnCalculate"
        Me.BtnCalculate.Size = New System.Drawing.Size(112, 24)
        Me.BtnCalculate.TabIndex = 4
        Me.BtnCalculate.Text = "&Calculate Bonus"
        '
        'BtnExit
        '
        Me.BtnExit.Font = New System.Drawing.Font("Microsoft Sans Serif", 8.25!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnExit.Location = New System.Drawing.Point(264, 63)
        Me.BtnExit.Name = "BtnExit"
        Me.BtnExit.Size = New System.Drawing.Size(112, 24)
        Me.BtnExit.TabIndex = 5
        Me.BtnExit.Text = "E&xit"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(392, 109)
        Me.Controls.Add(Me.BtnExit)
        Me.Controls.Add(Me.BtnCalculate)
        Me.Controls.Add(Me.TxtSales)
        Me.Controls.Add(Me.LblCommission)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.Name = "Form1"
        Me.Text = "Marshall Solution 1.0"
        Me.ResumeLayout(False)

    End Sub

#End Region


    Private Sub TextBox_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TxtSales.KeyPress
        Me.LblCommission.Text = ""
        If (e.KeyChar < "0" OrElse e.KeyChar > "9") AndAlso e.KeyChar <> ControlChars.Back Then
            e.Handled = True
        End If
        If e.KeyChar = ControlChars.Cr Then BtnCalculate.PerformClick()
    End Sub

    Private Sub BtnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnExit.Click
        Me.Close()
    End Sub

    Private Sub CalcButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnCalculate.Click
        Dim intSales As Long
        Dim dblCommission As Double = 0

        If TxtSales.Text <> "" AndAlso TxtSales.Text.Chars(0) <> "0" Then 'To avoid an Empty input and "001" 
            intSales = CLng(TxtSales.Text)
            Select Case intSales 'Select the proper case and Calculate the Commission 
                Case 1 To 100000
                    dblCommission = intSales * 0.02
                Case 100001 To 200000
                    dblCommission = 2000 + (intSales - 100000) * 0.04
                Case 200001 To 300000
                    dblCommission = 6000 + (intSales - 200000) * 0.06
                Case 300001 To 400000
                    dblCommission = 12000 + (intSales - 300000) * 0.08
                Case Is >= 400001
                    dblCommission = 200000 + (intSales - 400000) * 0.1
            End Select
            Me.LblCommission.Text = CStr(Format(dblCommission, "currency")) 'Display the Commission
        Else
            Me.LblCommission.Text = ""
            Me.TxtSales.Clear()
        End If
        Me.TxtSales.SelectAll()
        Me.TxtSales.Focus()
    End Sub

End Class