Sub Protect( _
   ByVal password As String, _
   ByVal protectStructure As Boolean, _
   ByVal protectWindows As Boolean _
) 

void Protect( 
   string password,
   bool protectStructure,
   bool protectWindows
)

Parameters

password

The password which will be required to open and / or unprotect the workbook.

protectStructure

Specifies whether the structure (number and order of worksheets) of this workbook may be changed.

protectWindows

Specifies whether the windows of this workbook are protected from changes.

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

Reference