Problem Encrypting uploaded files

Hi,
I am trying to provide my users with a way to upload files with their account.  Then, the files need to be encrypted.  I am using the method described in this forum http://forums.asp.net/t/1564422.aspx
Everything is working very well, except that I am getting the following error:
The process cannot access the file 'C:\Websites\TestSite1\Uploads\TestFiles\1690\1.jpg' because it is being used by another process.
Any help is greatly appreciated.  Here is my code behind:
Imports System Imports System.IO Imports System.Security Imports System.Security.Cryptography Imports DevExpress.Web.ASPxUploadControl Partial Class Members_EncryptFileTest1 Inherits System.Web.UI.Page #Region "1. Global Variables " '************************* '** Global Variables '************************* Dim strFileToEncrypt As Str ...