How to make upload button with in gridview to see that in c#

Hi Friends,
 
            I ve the aspx page  like these
--------- Travel.apsx-------------


DepartureDate = TextBox(jqueryDatepicker).

from= Textbox
To=textbox

Lodging=Textbox
foodbill=Textbox
DailyClaim=Textbox

Bill documents=Textbox upload(button)

ADD(button)


After Press The ADD Entire Details LL display GridView(alredy done These Much)



Now My requirement is How to do code for upload documents in My gridview if i choose the document ll original how to that?