Sequential Access file

[HIGHLIGHT]Public Class frmMain
 
    Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
        Me.Close()
    End Sub
    Private Sub frmMain_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        ' fill the list box with values
 
        lstParty.Items.Add("Democrats")
        lstParty.Items.Add("Republicans")
        lstParty.Items.Add("Independents")
    End Sub
    Private Sub txtAge_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtAge.KeyPress
        ' allows the text box to accept only numbers, the period, and the Backspace key
 
        If (e.KeyChar < "0" OrElse e.KeyChar > "9") AndAlso
            e.KeyChar <> ControlChars.Back Then
            ' cancel the key
            e.Handled = True
        End If
    End Sub
    Private Sub btnWrite_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnWrite.Click
 
        ' writes a political party to a sequential access file
        ' declare a StreamWriter variable
        Dim outFile As IO.StreamWriter
        Dim intnum As Integer
 
        ' open the file for append
        outFile = IO.File.AppendText("Party.txt")
 
        ' write the name on a separate line in the file
        outFile.WriteLine(lstParty.Items)
 
        ' Loop through the items in the listbox
        For intnum = 0 To lstParty.Items.Count - 1
            ' write the name on a separate line in the file
            outFile.WriteLine(lstParty.Items)
 
        Next
 
        ' close the file
        outFile.Close()
 
        ' set focus
        txtAge.Focus()
    End Sub
 
    Private Sub btnDisplay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
        ' reads political party from a sequential access file 
        ' and displays them in the interface
 
        ' declare variables
        Dim inFile As IO.StreamReader
 
        ' determine whether the file exists
        If IO.File.Exists("party.txt") Then
            'open the file for input
            inFile = IO.File.OpenText("party.txt")
            inFile.Close()
        Else
            MessageBox.Show("Can't find the file", "Political Party", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If
    End Sub
    Private Sub txtAge_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtAge.Enter
        txtAge.SelectAll()
    End Sub
End Class