Writing temp files - image

Question

I am currently trying to display the sharepoint thumbnail in a picturebox when i click a button on the form. What appears to be happening is the file is locked and will not let me replace the file or anything. I even created a counter so the file name is always different. When I run the first time everything works, after that I believe it cant write over the file. Am I doing something wrong is there a better method??
$User=GET-ADUser $UserName –properties thumbnailphoto
$Filename='C:\Support\Export'+$Counterz+'.jpg'
#$img = $Filename.Open( [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read, [System.IO.FileShare]::Read )
[System.Io.File]::WriteAllBytes($Filename, $User.Thumbnailphoto)
$Picture = (get-item ($Filename))
$img = [System.Drawing.Image]::Fromfile($Picture)
$pictureBox.Width = $img.Size.Width
$pictureBox.Height = $img.Size.Height
$pictureBox.Image = $img
$picturebox.dispose($Filename)
Remove-Item $Filename

Answer 1

You should be able to do this without creating a temporary file.
Just create $img like:
$img = [System.Drawing.Image]::FromStream([System.IO.MemoryStream]::new($User.thumbnailPhoto))
$pictureBox.Width = $img.Width
$pictureBox.Height = $img.Height
$pictureBox.Image = $img
Don't forget to remove the form from memory after closing with $form.Dispose()
If you insist on using a temporary file, then be aware that the $img object keeps a reference to the file untill it is disposed of.
Something like:
# get a temporary file name
$Filename = [System.IO.Path]::GetTempFileName()
[System.IO.File]::WriteAllBytes($Filename, $User.thumbnailPhoto)
# get an Image object using the data from the temporary file
$img = [System.Drawing.Image]::FromFile($Filename)
$pictureBox.Width = $img.Width
$pictureBox.Height = $img.Height
$pictureBox.Image = $img
$form.Controls.Add($pictureBox)
$form.ShowDialog()
# here, when all is done and the form is no longer needed, you can
# get rid of the $img object that still has a reference to the
# temporary file and then delete that file.
$img.Dispose()
Remove-Item $Filename
# clean up the form aswell
$form.Dispose()