Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ListBox1.Items.Add("Username: " & TextBox1.Text)
        ListBox1.Items.Add("Password: " & TextBox2.Text)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim Saveval As Integer = 1
        Dim Listpath As String = "C:\List Data Collection_" & Saveval & ".txt"
        Saveval = Saveval + 1
        For i = 0 To ListBox1.Items.Count - 1
            ListBox1.SetSelected(i, True)
            Dim Listwrite As System.IO.StreamWriter
            Listwrite = My.Computer.FileSystem. _
            OpenTextFileWriter(Listpath, True)
            Listwrite.WriteLine(ListBox1.Items(i))
            Listwrite.Close()
        Next
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        ListBox1.Items.Clear()
    End Sub
End Class