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......as well as the user can email the checked pdf file to a particulae email id


waiting eagarly for someone whoo can help me ....
thnx..........