File Upload into FTP Server

I am try to upload pdf file into FTP Server using fileupload control in asp.net(vb.net).
It's working fine in local system but it's not working if i access remotly(it's not working after published into server).If i choose local path like 'C:\000000017_1.pdf' i am getting following error:Could not find file 'C:\000000017_1.pdf'.
If try to upload the file from ftp to ftp i am getting following error:'Invalid Username or bad password'.
what could be the problem? please suggest me .....
its very urgent .....