## IFieldMergingCallback class

Implement this interface if you want to control how data is inserted into merge fields during a mail merge operation.


### Methods

| Name | Description |
| --- | --- |
|[ field_merging(args)](./field_merging/#fieldmergingargs) | Called when the Aspose.Words mail merge engine is about to insert data into a merge field in the document. |
|[ image_field_merging(args)](./image_field_merging/#imagefieldmergingargs) | Called when the Aspose.Words mail merge engine is about to insert an image into a merge field. |

### See Also

* module [aspose.words.mailmerging](../)