Specifies how to handle form fields when merging PDF documents.
public enum PdfControlMergingMode
Copy = 0
Copy PDF controls to the resulting document "as is". That might lead to an incorrect PDF document if both source documents contain controls with the same full name(s).
CopyAsKids = 4
Copy PDF controls and merge with existing controls having the same full name(s).
CopyWithRename = 1
Rename the added PDF controls if the resulting document contains controls with the same full name(s).
DoNotCopy = 3
Do not copy PDF controls to the resulting document.
Flatten = 2
Flatten the added PDF controls in the resulting document.