Reading from a textfile and adding the contents to different listboxes

[minitech]

Use some sort of flag when saving, something that would never be in either listbox. For example:

'Save routine
Dim sw As New IO.StreamWriter(filename)
Dim i As Integer = 0
While i < Me.ListBox1.Items.Count
     sw.WriteLine(CStr(Me.ListBox1.Items(i)))
     i+=1
End While
i = 0
sw.WriteLine("[SEPARATORSTRING]")
While i < Me.ListBox2.Items.Count
     sw.WriteLine(CStr(Me.ListBox2.Items(i)))
     i+=1
End While
sw.Close()

And do the opposite to save. Ignore that one line and switch listboxes after it.

[knicksfan426]

Use some sort of flag when saving, something that would never be in either listbox. For example:

'Save routine
Dim sw As New IO.StreamWriter(filename)
Dim i As Integer = 0
While i < Me.ListBox1.Items.Count
     sw.WriteLine(CStr(Me.ListBox1.Items(i)))
     i+=1
End While
i = 0
sw.WriteLine("[SEPARATORSTRING]")
While i < Me.ListBox2.Items.Count
     sw.WriteLine(CStr(Me.ListBox2.Items(i)))
     i+=1
End While
sw.Close()

And do the opposite to save. Ignore that one line and switch listboxes after it.

I switched your code around a little bit but I worked off of it. Thank you. Check out the code, I have a little problem

Save File code:

Private Sub SaveToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripMenuItem.Click
        SaveFileDialog1.Filter = ".txt (*.txt)|*.txt"
        SaveFileDialog1.DefaultExt = "txt"
 
        If SaveFileDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
 
            Using myWriter As New System.IO.StreamWriter(SaveFileDialog1.FileName)
 
                myWriter.WriteLine("|")
 
                For Each Item As String In ListBox1.Items
                    myWriter.WriteLine(Item)
                Next
 
                myWriter.WriteLine("||")
 
                For Each Item As String In ListBox2.Items
                    myWriter.WriteLine(Item)
                Next
 
 
            End Using
        End If
 
    End Sub

Open File code:

Private Sub OpenToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenToolStripMenuItem.Click
        OpenFileDialog1.Filter = ".txt (*.txt)|*.txt"
        OpenFileDialog1.DefaultExt = "txt"
 
        If OpenFileDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
 
            Dim myReader As New System.IO.StreamReader(OpenFileDialog1.FileName)
 
            If myReader.ReadLine = "|" Then
 
                Do Until myReader.ReadLine = "||"
                    ListBox1.Items.Add(myReader.ReadLine)
                Loop
 
            End If
 
        End If
 
    End Sub

As you can see, I've used the separator "|" for the listbox1 items and "||" for listbox2 items. In my open file coding, whenever I run the program, VB gives me an error on line 12 saying "Value cannot be null. Parameter name: item." What do I do about this? I can't find any way to properly work around it.

[minitech]

One of the lines will be blank if you use .WriteLine(). Just add "On Error Resume Next" at the beginning of your Sub.