Option Explicit On 
Option Strict 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 GroupBox2 As System.Windows.Forms.GroupBox
    Friend WithEvents LstStudents As System.Windows.Forms.ListBox
    Friend WithEvents BtnDesc As System.Windows.Forms.Button
    Friend WithEvents BtnAsc As System.Windows.Forms.Button
    Friend WithEvents BtnQuit As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.GroupBox2 = New System.Windows.Forms.GroupBox
        Me.LstStudents = New System.Windows.Forms.ListBox
        Me.BtnDesc = New System.Windows.Forms.Button
        Me.BtnAsc = New System.Windows.Forms.Button
        Me.BtnQuit = New System.Windows.Forms.Button
        Me.GroupBox2.SuspendLayout()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 18.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(136, 40)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(392, 37)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Dr Test's Midterm Analysis"
        '
        'GroupBox2
        '
        Me.GroupBox2.Controls.Add(Me.LstStudents)
        Me.GroupBox2.Location = New System.Drawing.Point(32, 168)
        Me.GroupBox2.Name = "GroupBox2"
        Me.GroupBox2.Size = New System.Drawing.Size(352, 248)
        Me.GroupBox2.TabIndex = 4
        Me.GroupBox2.TabStop = False
        Me.GroupBox2.Text = "Student Results (sorted)"
        '
        'LstStudents
        '
        Me.LstStudents.ItemHeight = 16
        Me.LstStudents.Location = New System.Drawing.Point(24, 32)
        Me.LstStudents.Name = "LstStudents"
        Me.LstStudents.Size = New System.Drawing.Size(312, 196)
        Me.LstStudents.TabIndex = 0
        '
        'BtnDesc
        '
        Me.BtnDesc.Location = New System.Drawing.Point(32, 104)
        Me.BtnDesc.Name = "BtnDesc"
        Me.BtnDesc.Size = New System.Drawing.Size(112, 40)
        Me.BtnDesc.TabIndex = 5
        Me.BtnDesc.Text = "High to Low"
        '
        'BtnAsc
        '
        Me.BtnAsc.Location = New System.Drawing.Point(168, 104)
        Me.BtnAsc.Name = "BtnAsc"
        Me.BtnAsc.Size = New System.Drawing.Size(112, 40)
        Me.BtnAsc.TabIndex = 6
        Me.BtnAsc.Text = "Low to High"
        '
        'BtnQuit
        '
        Me.BtnQuit.Location = New System.Drawing.Point(304, 104)
        Me.BtnQuit.Name = "BtnQuit"
        Me.BtnQuit.Size = New System.Drawing.Size(112, 40)
        Me.BtnQuit.TabIndex = 7
        Me.BtnQuit.Text = "Quit"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(760, 568)
        Me.Controls.Add(Me.BtnQuit)
        Me.Controls.Add(Me.BtnAsc)
        Me.Controls.Add(Me.BtnDesc)
        Me.Controls.Add(Me.GroupBox2)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.GroupBox2.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Dim scores(100) As Double
    Dim numStd As Integer

    Private Sub display(ByVal arr() As Double, ByVal numEl As Integer)
        Dim cnt As Integer
        For cnt = 0 To (numEl - 1)
            LstStudents.Items.Add(arr(cnt))

        Next
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim inpf As IO.StreamReader
        Dim std As Integer = 0
        Dim currLine As String
        Dim max As Double = 0
        Dim min As Double = 100
        Dim sum As Double = 0
        Dim middleMean As Double
        Dim curve As Double
        Dim cnt As Integer
        Dim outString As String
        If IO.File.Exists("scores.txt") Then
            ' read student scores out of file into array
            inpf = IO.File.OpenText("scores.txt")
            Do Until inpf.Peek = -1
                currLine = inpf.ReadLine()
                ' if appropriat einput add to the array and prepare to go to next element
                If IsNumeric(currLine) Then
                    scores(std) = Convert.ToDouble(currLine)
                    ' prepare for next student
                    std = std + 1
                End If
            Loop
            numStd = std
        End If
    End Sub

    Private Sub BtnDesc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnDesc.Click
        LstStudents.Items.Clear()
        Array.Sort(scores)
        Array.Reverse(scores)
        display(scores, numStd)

    End Sub

    Private Sub BtnAsc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnAsc.Click
        LstStudents.Items.Clear()
        Array.Sort(scores)
        Dim cnt As Integer
        For cnt = (100 - (numStd - 1)) To 100
            LstStudents.Items.Add(scores(cnt))
        Next cnt
    End Sub

    Private Sub BtnQuit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnQuit.Click
        Me.Close()

    End Sub
End Class