Creating and Opening Files

[lbgladson]

I have to create a form that accepts three test grades for three students and then writes them to a file and displays them to a list box and then it opens the file and displays it into a different list box. I have the following code but cannot get it to work quite right. It is accepting the grades and displaying them into the first list box but I don't think it is saving them to the file created and therefore will not display the results of the file into the second list box.

Imports System.IO

Public Class GradeReport
    Dim fileWriter As StreamWriter

    Dim fileName As String
    Dim grades(3, 2) As Integer
    Dim studentCount As Integer = 1

    Enum Student
        Student
    End Enum

    Private Sub GradeReport_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        inputGradeListBox.Items.Add(vbTab & vbTab & "Test 1" & vbTab & "Test 2" & vbTab & "Test 3")
    End Sub

    Private Sub NewToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewToolStripMenuItem.Click

        Dim result As DialogResult

        Using fileChooser As New SaveFileDialog()
            result = fileChooser.ShowDialog()
            fileName = fileChooser.FileName
        End Using

        If result <> Windows.Forms.DialogResult.Cancel Then
            Try
                fileWriter = New StreamWriter(fileName, True)

                CloseToolStripMenuItem.Enabled = True
                submitGradesButton.Enabled = True
                test1TextBox.Enabled = True
                test2TextBox.Enabled = True
                test3TextBox.Enabled = True
                inputGradeListBox.Enabled = True
                readGradeListBox.Enabled = True
            Catch ex As IOException
                MessageBox.Show("Error Opening File", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try
        End If
    End Sub

    Private Sub submitGradesButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles submitGradesButton.Click
        grades(studentCount, 0) = Convert.ToInt32(test1TextBox.Text)
        grades(studentCount, 1) = Convert.ToInt32(test2TextBox.Text)
        grades(studentCount, 2) = Convert.ToInt32(test2TextBox.Text)

        Dim output As String = "Student" & studentCount & vbTab

        For column = 0 To grades.GetUpperBound(1)
            output &= vbTab & grades(studentCount, column)
        Next

        inputGradeListBox.Items.Add(output)
        studentCount += 1

        If test1TextBox.Text <> String.Empty Then
            Try
                Dim test1 As Integer = Convert.ToInt32(test1TextBox.Text)

                If test1 > 0 Then
                    fileWriter.WriteLine(test1 & "," &
                                         test2TextBox.Text & "," &
                                         test3TextBox.Text)
                Else
                    MessageBox.Show("Invalid Account Number", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                End If
            Catch ex As IOException
                MessageBox.Show("Error Writing to File", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Catch ex As FormatException
                MessageBox.Show("Invalid test score", "Format Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try
        End If
        test1TextBox.Clear()
        test2TextBox.Clear()
        test3TextBox.Clear()
        test1TextBox.Focus()

        
    End Sub

    Private Sub CloseToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CloseToolStripMenuItem.Click
        CloseToolStripMenuItem.Enabled = False
        NewToolStripMenuItem.Enabled = False
        test1TextBox.Enabled = False
        test2TextBox.Enabled = False
        test3TextBox.Enabled = False
        submitGradesButton.Enabled = False
        readButton.Enabled = False
        inputGradeListBox.Enabled = False
        readGradeListBox.Enabled = False
        OpenToolStripMenuItem.Enabled = True
    End Sub


    Private Sub OpenToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenToolStripMenuItem.Click
        Dim result As DialogResult

        Using fileChooser As New OpenFileDialog()
            result = fileChooser.ShowDialog()
            fileName = fileChooser.FileName
        End Using

        If result <> Windows.Forms.DialogResult.Cancel Then
            readButton.Enabled = True
        End If
    End Sub


    Private Sub readButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles readButton.Click
        Dim fileReader As StreamReader = Nothing

        Try
            fileReader = New StreamReader(fileName)

            Do While Not fileReader.EndOfStream
                Dim line As String = fileReader.ReadLine()
                Dim fields() As String = line.Split(","c)
            Loop

        Catch ex As Exception

            DisplayStudents(Student.Student)

        End Try
    End Sub

    Sub DisplayStudents(ByVal student As Student)
        Dim fileReader As StreamReader = Nothing

        Try
            fileReader = New StreamReader(fileName)
        Catch ex As Exception

            Do While Not fileReader.EndOfStream
                Dim line As String = fileReader.ReadLine()
                Dim fields() As String = line.Split(","c)

                Dim test1 As Integer = Convert.ToInt32(fields(0))
                Dim test2 As Integer = Convert.ToInt32(fields(1))
                Dim test3 As Integer = Convert.ToInt32(fields(2))
            Loop


        Catch ex As IOException
            MessageBox.Show("Cannot REad File", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        Finally
            If fileReader IsNot Nothing Then
                Try
                    fileReader.Close()
                Catch ex As IOException
                    MessageBox.Show("Error closing file", "Error" MessageBoxButtons.OK, MessageBoxIcon.Error)
                Catch ex As Exception

                End Try
            End If

        End Try
    End Sub
End Class