CustomProperties interface
Office 2013 and later
A collection of CustomProperty objects that represent additional information. The information can be used as metadata for XML.
Namespace: Microsoft.Office.Interop.Excel
Assembly: Microsoft.Office.Interop.Excel (in Microsoft.Office.Interop.Excel.dll)
Use the Properties property of the SmartTag object, or the CustomProperties property of the Worksheet object, to return a CustomProperties collection.
Once a CustomProperties collection is returned, you can add metadata to worksheets and smart tags depending on which you choose to work with.
To add metadata to a worksheet, use the CustomProperties property with the Add method.
To add metadata to a smart tag, use the Properties property with the Add method.
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