textfile length

Hello, I have a form with a textbox and a timer. The timer is set to an interval of 600. When the timer fires, it loads C:\messages.text into a textbox. How can I have it do the following:

Check the linecount of the file, if it changed since the last time it opened..add the current time to the last line in the file. If that last line is blank...move back one until the current line isnt blank...then save the textfile.

VB Code:

Private Sub Timer1_Timer()
    Dim hFile As Integer, sLines() As String, sText As String
    Static nLines As Long
    On Error Resume Next
    hFile = FreeFile
    Open "c:\message.txt" For Binary As #hFile
        sText = Input(LOF(hFile), hFile)
    Close #hFile
    sLines = Split(sText, vbCrLf)
    If UBound(sLines) <> nLines Then
        Do While Right$(sText, 2) = vbCrLf
            sText = Left$(sText, Len(sText) - 2)
        Loop
        sText = sText & vbCrLf & Now
        nLines = UBound(Split(sText, vbCrLf))
        Open "c:\messages.txt" For Output As #hFile
            Print #hFile, sText
        Close #hFile
    End If
    If Text1.Text <> sText Then
        Text1.Text = sText
    End If
End Sub

That code keeps adding the date & time to the textfile even when the file isnt changed...what i am wanting is for the program to detect when somethings added to the textfile...when its added...add the date/time to the end of the last line.

Oh yeah of course! When the file is saved a new newline is added to it. Change the code to this:

VB Code:

Private Sub Timer1_Timer()
    Dim hFile As Integer, sLines() As String, sText As String
    Static nLines As Long
    On Error Resume Next
    hFile = FreeFile
    Open "c:\message.txt" For Binary As #hFile
        sText = Input(LOF(hFile), hFile)
    Close #hFile
    sLines = Split(sText, vbCrLf)
    If UBound(sLines) <> nLines Then
        Do While Right$(sText, 2) = vbCrLf
            sText = Left$(sText, Len(sText) - 2)
        Loop
        sText = sText & vbCrLf & Now
        nLines = UBound(Split(sText, vbCrLf))
        Open "c:\messages.txt" For Output As #hFile
            Print #hFile, sText[b][color=red];[/color][/b] '<- Added a semicolon here
        Close #hFile
    End If
    If Text1.Text <> sText Then
        Text1.Text = sText
    End If
End Sub