extracting a text fle from network folder C# IO how do I check if file is ready

Visual studio 2008 - C# - on windows.
H I ned to watch a network folder (Source Folder) for a text file to land there. Once I see the file I need to move that file to somewhere else (Destination).
However the 3Rd party system that writes the file to Source may still be sriting contents or may not even be finished copying the file to Source when I attempt to move it to destination.
I want to wait till the 3RdPart app is finished with the file , then move it.
What is the coding I should use ? and what classes and methods can I use please?
Please paste some simple code lines rather than directing me to links if possible.
Thanks.
indikadAsked:
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saifikram_mdConnect With a Mentor Commented:
FileSystemWatcher is the best way to use. follow the link below

FileWatcher
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ZhaolaiConnect With a Mentor Commented:
Try this:
If Len(strFileName) > 0 AndAlso System.IO.File.Exists(strFileName) Then
            'need to make sure that the file is ready to be copied.
            Do While True
                'try to open the file for read. If failed, try again, until it's ready
                Dim tmp As System.IO.StreamReader = System.IO.File.OpenText(strFileName)

                If tmp IsNot Nothing Then
                    tmp.Close()
                    tmp.Dispose()
                    System.Threading.Thread.Sleep(10)
                    Exit Do
                End If
                System.Threading.Thread.Sleep(10)
            Loop
        End If

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indikadAuthor Commented:
Thanks very much
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