Как прервать остановить выполнение функции - VB

Option Explicit
 
Dim fso As New FileSystemObject
Dim fld As Folder
 
Private Sub Command1_Click()
   Dim nDirs As Long, nFiles As Long, lSize As Currency
   Dim sDir As String, sSrchString As String
   sDir = InputBox("Type the directory that you want to search for", _
                   "FileSystemObjects example", "C:\")
   sSrchString = InputBox("Type the file name that you want to search for", _
                   "FileSystemObjects example", "vb.ini")
   MousePointer = vbHourglass
   Label1.Caption = "Searching " & vbCrLf & UCase(sDir) & "..."
   lSize = FindFile(sDir, sSrchString, nDirs, nFiles)
   MousePointer = vbDefault
   MsgBox Str(nFiles) & " files found in" & Str(nDirs) & _
          " directories", vbInformation
   MsgBox "Total Size = " & lSize & " bytes"
End Sub

Private Function FindFile(ByVal sFol As String, sFile As String, _
   nDirs As Long, nFiles As Long) As Currency
   Dim tFld As Folder, tFil As File, FileName As String
   
   On Error GoTo Catch
   Set fld = fso.GetFolder(sFol)
   FileName = Dir(fso.BuildPath(fld.Path, sFile), vbNormal Or _
                  vbHidden Or vbSystem Or vbReadOnly)
   While Len(FileName) <> 0
      FindFile = FindFile + FileLen(fso.BuildPath(fld.Path, _
      FileName))
      nFiles = nFiles + 1
      List1.AddItem fso.BuildPath(fld.Path, FileName)  ' Load ListBox
      FileName = Dir()  ' Get next file
      DoEvents
   Wend
   Label1 = "Searching " & vbCrLf & fld.Path & "..."
   nDirs = nDirs + 1
   If fld.SubFolders.Count > 0 Then
      For Each tFld In fld.SubFolders
         DoEvents
         FindFile = FindFile + FindFile(tFld.Path, sFile, nDirs, nFiles)
      Next
   End If
   Exit Function
Catch:  FileName = ""
       Resume Next
End Function

Private Sub Form_KeyPress(KeyAscii As Integer)
If KeyAscii = vbKeyCancel Then End Sub
End Sub