Error in Upload and download binary (zip) files to Oracle Blob

Hello,

I am really stuck with a problem for a day and half. Any help will be highly
appriciated.

I implemented a functionality to upload & download files to Oracle (blob
field). The code that I used was in C# retreived from Oracle website:
http://www.oracle.com/technology/sample_code/tech/windows/odpnet/howto/anonyblock/index.html

The code works with text & images files and I can upload & download images
with no problem. However, when I try to upload and download Zip files, Winzip
cannot open the file that was just downloaded from Oracle. It had no problem
with the file before I uploaded it to the database.

Thanks

.