VS 2008 Upload Files To Webserver From Time To Time?

I have a webserver and I upload files to my webserver from time to time. I have an ftp account which points to public_html that is main directory.

I though why give full access so I created another ftp account (e.g. test) which points to a specific folder. Now when I try to upload a file using test it fails.

For e.g.

the following code works:
My.Computer.Network.UploadFile("d:ok.txt", "ftp://mysite.com/Test/okay.txt", "main@mysite.com", "mainpw")

- this is because this a/c has access to root folder of website

now following code gives error -

My.Computer.Network.UploadFile("d:ok.txt", "ftp://mysite.com/Test/okay.txt", "test@mysite.com", "testpw")

The remote server returned an error: (550) File unavailable (e.g., file not found, no access).

Well the ftp account test has been given access to a specific folder with the name "Test". So it should at least upload to that folder.

But if I use ftp client (like filezilla) then it works.