FileStream can't access the file because it's being used by another process

Question

I\'m new at web app in ASP.NET and I came across this problem.

I have a page whe there is a Button to download a template.xls that is previously stored at a SharePoi

Answer 1

i have solved this problem by another way

i open Window Task Manager and find that my dll file of my project is running

multiples ( i mean copy of it exists) i remove them and than my problem is solved