_Workbook::CustomDocumentProperties property
Office 2013 and later
Returns or sets a DocumentProperties collection that represents all the custom document properties for the specified workbook.
Namespace: Microsoft.Office.Interop.Excel
Assembly: Microsoft.Office.Interop.Excel (in Microsoft.Office.Interop.Excel.dll)
This property returns the entire collection of custom document properties. Use the Item method to return a single member of the collection (a DocumentProperty object) by specifying either the name of the property or the collection index (as a number).
The Item method is the default method for the DocumentProperties collection.
Use the BuiltinDocumentProperties property to return the collection of built-in document properties.
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