static Workbook workbook;
static void Main(string[] args)
{
    workbook = new Workbook();
    workbook.LoadDocument("Documents\\Spreadsheet Book.xls");
    workbook.BeforePrintSheet += Workbook_BeforePrintSheet;
}

private static void Workbook_BeforePrintSheet(object sender, BeforePrintSheetEventArgs e)
{
    if (workbook.Worksheets[e.Name].Shapes.Count != 0) e.Cancel = true;
}

Shared workbook As Workbook

Private Shared Sub Main(ByVal args As String())
    workbook = New Workbook()
    workbook.LoadDocument("Documents\Spreadsheet Book.xls")
    workbook.BeforePrintSheet += AddressOf Workbook_BeforePrintSheet
End Sub

Private Shared Sub Workbook_BeforePrintSheet(ByVal sender As Object, ByVal e As BeforePrintSheetEventArgs)
    If workbook.Worksheets(e.Name).Shapes.Count <> 0 Then e.Cancel = True
End Sub