How Add all Paragraph as one Docx file to between of other docx file

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C#

hi i am one big problem ..!!!
i do not copy full pargraph of one docx file to between of other docx file
use the Microsoft.Office.Interop.Word name space

for exapmle


docx 1
----------
it is a book.
the book is good.

it is pen.
the color of pen is red.
....
...


docx 2
---------
hi teacher.


it is ok.



result
--------

hi teacher.


it is a book.
the book is good.

it is pen.
the color of pen is red.
....
...


it is ok.