[]
Gets or sets whether the first page number is automatically assigned.
The default value is true. When the first page number is specified,
this property returns false.
bool IsAutoFirstPageNumber { get; set; }
Property IsAutoFirstPageNumber As Boolean
IPageSetup pageSetup = worksheet.PageSetup;
pageSetup.FirstPageNumber = 3;
bool isAutoFirstPageNumber = pageSetup.IsAutoFirstPageNumber;