Want to add page in pdf file at run time

Question

I have on workbook with various chapter which is in pdf format, and I am going to split it. 

 

chapter vise splitting was done.

 

but, 

 

in workbook their is first page having student information .

now I want to add that fisrt page as a first page of ever splitted file of workbook. 

 

For spliting workbook I am using iTextSharp.dll, and merge pages using intervals as

 

SplitAndSaveInterval(workbookpath, updateWBFile, startpage, interval); 

 

startpage = chapter first page no.

interval = number of page upto next chapter

 

 

please help me for add first page into all splitted file