how to make upload depends the particular user id in c#?

Question

Hi,


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)

 upload documents in ll show on  My gridview

Now My requirement is possible to show upload attachement depends on the Logged in users?