关于EXCEL释放控制的问题

两个问题
1、为什么EXCEL释放不了控制，怎么解决？


2、为什么导EXCEL进去的时候会有间隔呢



代码如下

Private Sub Command1_Click()
Dim i As Integer
Dim ss As String
Dim kk As Integer
Dim jj As Integer
Dim cho As Boolean
Dim xlapp As Excel.Application 'Excel对象
Dim xlbook As Excel.Workbook '工作簿
Dim xlsheet As Excel.Worksheet '工作表


'On Error GoTo userCanceled
  
With CommonDialog1
    .CancelError = True
    .Flags = cdlOFNHideReadOnly Or cdlOFNAllowMultiselect Or cdlOFNExplorer Or cdlOFNNoDereferenceLinks
    .Filter = "excel文件(*.xls)|*.xls|excel文件(*.xlsx)|*.xlsx"
    .ShowOpen
     'ShellExecute Me.hWnd, "open", .FileName, "", "", SW_HIDE
     'Dim WinWnd As Long
     'WinWnd = FindWindow(vbNullString, "Microsoft Excel - " & .FileTitle)
     'If WinWnd <> 0 Then
     'ShowWindow WinWnd, SW_HIDE
     'End If
End With

ss = CommonDialog1.FileName
Set xlapp = CreateObject("excel.application")
Set xlbook = xlapp.Workbooks.Open(ss)
xlapp.Visible = False

Set xlsheet = xlbook.Worksheets(1)
For j = 1 To 100
  For i = 1 To 9
    If xlsheet.Cells(j + 1, i + 1) = "" Then
      MsgBox "表格中第" & j + 1 & "行" & "第" & i + 1 & "列存在空白单元格，录入已中止！", vbInformation
      Exit Sub
    End If
  Next
  
  jj = ListView1.ListItems.Count
  If jj > 0 Then
    For kk = 1 To jj
      If xlsheet.Cells(j + 1, 4) = ListView1.ListItems(kk).SubItems(3) Then
        If MsgBox("表格中第" & j + 1 & "行的物料编码列表中已存在，是否确认覆盖？", vbCritical + vbYesNo, "提示") = vbNo Then
          MsgBox "录入已中止，可调整编码后重新导入！"
          Exit Sub
        Else
          For i = 1 To 9
            ListView1.ListItems(kk).SubItems(i) = xlsheet.Cells(j + 1, i + 1) & ""
          Next
          Exit For
        End If
      Else
        ListView1.ListItems.Add , , jj + 1
        For i = 1 To 9
          ListView1.ListItems(jj + 1).SubItems(i) = xlsheet.Cells(j + 1, i + 1) & ""
        Next
      End If
    Next
  Else
    ListView1.ListItems.Add , , 1
    For i = 1 To 9
      ListView1.ListItems(1).SubItems(i) = xlsheet.Cells(2, i + 1) & ""
    Next
  End If
Next

xlbook.Close
xlapp.Quit

Set xlapp = Nothing
Set xlbook = Nothing
Set xlsheet = Nothing
'userCanceled:
End Sub