550 error on retrieving filesize while uploading file - powershell

Question

I'm trying to get the file size while I'm uploading the file. My end goal is to try and get the upload speed, but in my while loop i get a Exception calling "OpenRead" with "1" argument(s): "The remote server returned an error: (550) File unavailable (e.g., file not found, no access).
Please see code below
$uploadRemoteFile = "Remote URI"
$ftpuname = "UserName"
$ftppassword = 'Password'
function upload-ftp{
$File = "$env:TEMP\something.exe"
$webclient = New-Object System.Net.WebClient
$webclient.Credentials = New-Object System.Net.NetworkCredential($ftpuname,$ftppassword);
$uri = New-Object System.Uri($uploadRemoteFile)
$webclient.UploadFileAsync($Uri, $File)
$arrayftp = #()
Function Get-newfilesize{
$webclientRead = New-Object System.Net.WebClient;
$webclientRead.Credentials = New-Object System.Net.NetworkCredential($ftpuname,$ftppassword);
[void]$webclientRead.OpenRead($uri);
[Int64]$bytes_total= ($webclientRead.ResponseHeaders["Content-Length"])
$webclientsize = ($bytes_total.ToString());
$webclientsize
}
while ($webclient.IsBusy){
$oldftpfile = Get-newfilesize;
$oldftpdate = Get-Date;
Start-Sleep -Milliseconds 1
$newftpfile = Get-newfilesize;
$newftpdate = Get-Date;
$ftpsizediff = $newftpfile - $oldftpfile;
$ftptimediff = $newftpdate - $oldftpdate;
$totalftpdiff = $ftpsizediff / $ftptimediff.totalseconds;
$totalftpdiff | foreach {
if ($_ -gt 0){$arrayftp += $_ }
}
}
$testftpcap= New-Object psobject -Property #{"Upload Speed" =((($arrayftp | measure -Average).Average/1MB)* 10)}
$testftpcap | Export-csv -NoTypeInformation -Path $env:TEMP\ftpspeed.csv
}
Thanks

Answer 1

Not exactly a direct answer to your question but you could use Powershell FTP module - works great and has a progress bar too..
(http://gallery.technet.microsoft.com/scriptcenter/PowerShell-FTP-Client-db6fe0cb)