Aspose.Words for .NET 9.2 introduced a number of breaking changes in the public API. One of the changes is that all events and delegates were replaced with properties and interfaces. All the functionality remains the same, we just had to stop using .NET events and delegates and implement it using the more classic approach of callback interfaces. We have done this so we can port our Aspose.Words C# code to Java using an automated tool. You do not benefit from this change directly if you are using Aspose.Words for .NET, but we all will be better off in many ways when our Aspose.Words for .NET and Java match each other closely.

This video shows how to change your code to accommodate for the fact that the MailMerge.MergeField event was replaced with the MailMerge.FieldMergingCallback property and MergeFieldEventHandler was replaced with the IFieldMerging interface. This is a quick and dirty video so please excuse for the unpolished voice over.