Assembly: Microsoft.Office.Interop.Word (in microsoft.office.interop.word.dll)
The MailMergeDataField object is a member of the MailMergeDataFields collection. The MailMergeDataFields collection includes all the data fields in a mail merge data source (for example, Name, Address, and City).
Use DataFields(index), where index is the data field name or the index number, to return a single MailMergeDataField object. The index number represents the position of the data field in the mail merge data source.
You cannot add fields to the MailMergeDataFields collection. All data fields in a data source are automatically included in the MailMergeDataFields collection.