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DocIO provides support to perform Mail merge with predefined list of fields. Please find the following online documentation link and sample link for your reference.
Online Sample Link:
We have added a sample for creating a template Word document with predefined list of fields from the data source to perform Mail merge in Windows Forms application. If this sample meets you requirement and you need the same in ASP.NET MVC platform, please let us know. We will update you with the sample for your preferred platform.
If we misunderstood your requirement, kindly elaborate your requirement with clear description (like screenshot of your output or expected output document). Thereby we will analyze further on your requirement and update you appropriate solution at the earliest.
Please let us know if you have any questions.