public void MappedDataFields()
{
Document doc = new Document();
//ExStart
//ExFor:MailMerge.MappedDataFields
//ExFor:MappedDataFieldCollection
//ExFor:MappedDataFieldCollection.Add
//ExId:MailMergeMappedDataFields
//ExSummary:Shows how to add a mapping when a merge field in a document and a data field in a data source have different names.
doc.MailMerge.MappedDataFields.Add("MyFieldName_InDocument", "MyFieldName_InDataSource");
//ExEnd
}