VB - cannot copy file due to "being used by another process" error - vb.net

Question

I haven't been able to pinpoint exactly what is causing this error. All im trying to do is copy files (pdfs) that were created on the current day from 1 directory to another after a certain amount of time with the ticker. Here is my code:
Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
Dim file As String
Dim now As String = DateTime.Today.ToShortDateString
Dim dir As String = "C:\PDFs\"
Dim bupdir As String = "C:\PDFs\copied\"
Dim Files() As String = Directory.GetFiles(dir)
For Each file In Files
Dim dt As String = IO.File.GetLastWriteTime(file).ToShortDateString
If dt = now Then
IO.File.Copy(Path.Combine(dir, file), Path.Combine(bupdir, file), True)
End If
Next
End Sub

Answer 1

Your problem lies in the fact that Directory.GetFiles() returns the full path name of the files in the source directory.
Then, when you try to build the destination file name, the Path.Combine sees that your file variable is an absolute path and doesn't add the path bupdir.
This gives back the value of the variable file and you end up with something like this
IO.File.Copy("C:\PDFs\file.pdf", "C:\PDFs\file.pdf", True)
To fix the problem
IO.File.Copy(file, Path.Combine(bupdir, Path.GetFileName(file)), True)
FROM MSDN
If one of the specified paths is a zero-length string, this method
returns the other path. If path2 contains an absolute path, this
method returns path2.