Sequential Access file

Hi Everybody,

I have been working on this assignment for quite a long time and now seeking help. I need to create a visual basic application where an organization needs to save each respondent's information (political party and age) to a sequential access file. The application also should calculate and display the number of voters in each political party (Democratic, Republican, and Independent).

Please see below code. When I tried to run, I'm getting the "System.Windows.Forms.ListBox+ObjectCollection" in my text file. Can you please provide me guidance what I'm doing wrong? Many thanks for your help!!!!

vb.net Code:

[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

[/HIGHLIGHT]

Edit your post. Highlight all of the code, click the VB button and then type vb.net when it asks you for a highlight tag. This will make the code easier for us to read.

Sorry!!! Thank you for the tip!!!

outFile.WriteLine(lstParty.Items)

Think about what this line does (ie. what lstParty.Items is!)

Ok. I have updated it to:

' 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(intnum)

Next

Still not working...please provide some more guidance, please....

What is it that you actually want to write to each line of the file? It certainly isn't the value of intnum, nor is it the whole collection of lstParty.Items. What do you reckon the happy medium might be? I am of course assuming that you made some effort to understand how a Listbox works before you decided to use it.

The party box list should contain three items: Democratic, Republican and Independent. The application should calculate and display the number of voters in each political party. Currently in my text file, it's listing all of the political party:
Democrats
Republicans
Independents
Democrats
Republicans
Independents
Democrats
Republicans
Independents
Democrats
Republicans
Independents

How do I get the application to write to only what the user selects in the party list box? Please... Thanks in advance for your help.

Can someone please review my streamreader code and please let me know what I need to do in order to tabulate the selected political party? I keep having "zero" in all of the labels. Please help. Thank you very much in advance!!!

vb.net Code:

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
 
        ' open the file for append
        outFile = IO.File.AppendText("Party.txt")
 
        ' write the name on a separate line in the file
        outFile.Write(lstParty.Text)
        outFile.Write(",")
        outFile.Write(txtAge.Text)
        outFile.WriteLine()
 
        ' 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
        Dim strParty As String
        Dim intDem As Integer
        Dim intRep As Integer
        Dim intInd As Integer
 
        If IO.File.Exists("Party.txt") Then
            'open the file for input
            inFile = IO.File.OpenText("Party.txt")
            ' process loop instructions until the end of file
            Do Until inFile.Peek = -1
                ' read a name
                strParty = inFile.ReadLine
                Select Case strParty
                    Case "Democrats"
                        intDem += 1
                        'lblDemocrats.Text = intDem.ToString
                    Case "Republicans"
                        intRep += 1
                        'lblRepublicans.Text = intRep.ToString
                    Case "Independents"
                        intInd += 1
                        'lblIndependents.Text = intInd.ToString
                End Select
                ' add name to list box
                lblDemocrats.Text = intDem.ToString
                lblRepublicans.Text = intRep.ToString
                lblIndependents.Text = intInd.ToString
            Loop
            ' close the file
            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

Attachment 99305

Quote:

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outFile.Write(lstParty.Text)

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Oh, come on. If you're not prepared to read the documentation why should anybody want to help you? Here is as good a tutorial on Listboxes as there is.