Question browse for all pdf file in the directory?

[suju_26pro]

Hii to every reader, i am new to this site...this my first post , i need a help..

i am creating a application to sign an pdf document..
i am stuck at one place..

i want the user to browse for all pdf file in the directory and display the selected pdf file from a specific folder in a "checklistbox"...he should be able to select multiple file or a specific folder from which all the pdf file must get listed in checklistbox......

plz help me out i am given the screenshot of required ui for better understanding plz have a look ..
waiting eagarly for someone whoo can help me ....
thnx..........

 

[suju_26pro]

the pdf document is signing but cannot be open in adobe reador..its says it is corrupted..i troubleshoot a little bit ..i got that in 'outputbox' there was a code which i had make it comment...so i uncomment it..also while debugging the code in my status bar the code stop at creating the meta data,,,so i go through it and show it is also written in comment so i also uncomment that too..after all this it still give me error ..plz help me out...i had attached and application ..plz he a look and do some favour 4 me plzzz......