How to access Excel document properties using WinForms XlsIO?

IWorkbook workbook = application.Workbooks.Open(inputPath, ExcelOpenType.Automatic);
 
// Accessing the BuiltInDocument properties.
IBuiltInDocumentProperties builtInDocumentProperties = book.BuiltInDocumentProperties;
string author = builtInDocumentProperties.Author;
string applicationName = builtInDocumentProperties.ApplicationName;
 
string comments = builtInDocumentProperties.Comments;
string company = builtInDocumentProperties.Company;
DateTime creationDate = builtInDocumentProperties.CreationDate;
TimeSpan editTime = builtInDocumentProperties.EditTime;
string keywords = builtInDocumentProperties.Keywords;
string lastAuthor = builtInDocumentProperties.LastAuthor;
DateTime lastPrinted = builtInDocumentProperties.LastPrinted;
DateTime lastSaveDate = builtInDocumentProperties.LastSaveDate;
bool linksDirty = builtInDocumentProperties.LinksDirty;
string manager = builtInDocumentProperties.Manager;
string presentationTarget = builtInDocumentProperties.PresentationTarget;
string revisionNumber = builtInDocumentProperties.RevisionNumber;
string subject = builtInDocumentProperties.Subject;
string template = builtInDocumentProperties.Template;
string title = builtInDocumentProperties.Title;

'Step 1 : Instantiate the spreadsheet creation engine.
Dim excelEngine As ExcelEngine = New ExcelEngine()
'Step 2 : Instantiate the excel application object.
Dim application As IApplication = excelEngine.Excel
 
Dim inputPath As String = GetFullTemplatePath("Sample.xlsx")
 
Dim workbook As IWorkbook = application.Workbooks.Open(inputPath, ExcelOpenType.Automatic)
 
'The Accessing the BuiltInDocumentProperties.
Dim builtInDocumentProperties As IBuiltInDocumentProperties = book.BuiltInDocumentProperties
Dim author As String = builtInDocumentProperties.Author
Dim applicationName As String = builtInDocumentProperties.ApplicationName
 
Dim comments As String = builtInDocumentProperties.Comments
Dim company As String = builtInDocumentProperties.Company
Dim creationDate As DateTime = builtInDocumentProperties.CreationDate
Dim editTime As TimeSpan = builtInDocumentProperties.EditTime
Dim keywords As String = builtInDocumentProperties.Keywords
Dim lastAuthor As String = builtInDocumentProperties.LastAuthor
Dim lastPrinted As DateTime = builtInDocumentProperties.LastPrinted
Dim lastSaveDate As DateTime = builtInDocumentProperties.LastSaveDate
Dim linksDirty As Boolean = builtInDocumentProperties.LinksDirty
Dim manager As String = builtInDocumentProperties.Manager
Dim presentationTarget As String = builtInDocumentProperties.PresentationTarget
Dim revisionNumber As String = builtInDocumentProperties.RevisionNumber
Dim subject As String = builtInDocumentProperties.Subject
Dim template As String = builtInDocumentProperties.Template
Dim title As String = builtInDocumentProperties.Title