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Thanks for your inquiry. I suppose, you would like to read data from mail merge data source attached to the template. If so, unfortunately, Apsose.Words does not support this feature yet. I linked your request to the appropriate issue. You will be notified as soon as it is available.
We are going to support Mail Merge data sources in Aspose.Words in 1-2 months.
For now, you should prepare template in MS Word, i.e. insert appropriate mergefields into the document and only then perform mail merge using Aspsoe.Words.