常常程式碼內有許多空行，本來就很長了，加上空行就變更長了，這時就需要把那些無用的空行刪除了。

Private Sub DelSpace_Click()
    Open App.Path & "\log.txt" For Output As #1 '存到\log.txt
    Print #1, TxtMain    'strsql是變數名稱
    Close #1
    Dim a, i
    Open App.Path & "\log.txt" For Input As #1 '載入 檔案\log.txt
    While Not EOF(1)
        Line Input #1, a
        List1.AddItem a '增加list1.additem
    Wend
    Close #1
    Open App.Path & "\log.txt" For Output As #2 '存到\log.txt
    For i = 0 To List1.ListCount - 1
        List1.ListIndex = i
        If Len(Trim(List1.Text)) > 0 Then Print #2, List1.Text
    Next
    Close #2
    Open App.Path & "\log.txt" For Input As #1 '重新載入 檔案log.txt
    TxtMain.Text = ""
    List1.Clear
    While Not EOF(1)
        Line Input #1, a
        TxtMain = TxtMain + a + vbCrLf '增加list1.additem
    Wend
    Close #1
End Sub