Hi Chathuranga,
Thank you for your interest in Syncfusion products.
We are not able to reproduce the mentioned issue with GetMergeFieldNames()
method. For your reference please find the sample that we have used to
reproduce the issue.
Sample:
http://www.syncfusion.com/downloads/Support/DirectTrac/99902/Sample411530762.zip
Could you please provide us the input document and code
snippets that you have used on your side? So that we can analyze further the
exact cause of issue and provide you the proper solution.
Please let us know if you have any question.
Regards
Ramkumar