Workbook.Protect(String, Boolean, Boolean) Method
Protects the structure and windows of a workbook.
A string that specifies a password for the workbook. If an empty string is specified, the workbook can be unprotected without a password.
true, to lock the structure of the workbook (the position of the sheets); otherwise, false.
true, to prevent users from changing the position of worksheet windows; otherwise, false.
Locked structure of the workbook prevents users from adding or deleting worksheets, from hiding worksheets or displaying hidden worksheets. Locked windows option prevents users from freezing or unfreezing panes.
If the workbook is already protected (the Workbook.IsProtected property is true), the Protect method raises an exception.
' Protect workbook structure (prevents users from adding or deleting worksheets ' or from displaying hidden worksheets). workbook.BeginUpdate() If Not workbook.IsProtected Then workbook.Protect("password", True, False) End If workbook.Worksheets(0).Visible = False Dim worksheet As Worksheet = workbook.Worksheets(1) worksheet("D5").Value = "You are not allowed to add or delete a worksheet." worksheet("D6").Value = "Hidden worksheets cannot be displayed." workbook.EndUpdate()