How to read Word, Excel Metadata by Vb.net? - asp.net

Question

i want to read the metadata (such as author, keywords, etc.) of the Word, Excel file by asp.net (vb). How can I do that ?
is there any sample, reference site ?
i found the following code online, but it return error for the 2nd statement (" Dim excelbook As New Microsoft.Office.Interop.Excel.Workbook ")
Public Sub ReadExcel(ExcelFileName As String)
Dim Wapp As New Microsoft.Office.Interop.Excel.Application
Dim excelbook As New Microsoft.Office.Interop.Excel.Workbook
If Wapp Is Nothing Then
Wapp = New Microsoft.Office.Interop.Excel.Application
End If
If excelbook Is Nothing Then
excelbook = New Microsoft.Office.Interop.Excel.Workbook
Else
excelbook.Close()
End If
excelbook = Wapp.Workbooks.Open(ExcelFileName)
Dim _BuiltInProperties As Object = excelbook.BuiltinDocumentProperties
If Not _BuiltInProperties Is Nothing Then
excel_keyword = _BuiltInProperties("Keywords").Value
End If
If Not excelbook Is Nothing Then
excelbook.Close()
End If
If Not Wapp Is Nothing Then
Wapp.Quit()
End If
End Sub

Answer 1

here is the example for the same. Or you can download from https://dl.dropbox.com/u/79986486/StackOverFlow9684368.zip {Temporary}
You can use openXML with C# or VB.Net to achive this.
Hope this helps.

Answer 2

Quoting from Social.MSDN
You can access the values using DSOFile (works for a whole bunch of different fileTypes), or more simply, you can access these properties like this in VBA
Sub Macro1()
'
' Macro1 Macro
'
Dim mWorkbook As Workbook
Set mWorkbook = Application.Workbooks(1)
mWorkbook.BuiltinDocumentProperties("Author").Value = "the Author"
mWorkbook.BuiltinDocumentProperties("Title").Value = "the Title"
mWorkbook.BuiltinDocumentProperties("Subject").Value = "the Subject"
End Sub