My.Computer.Network.DownloadFile and KeepAlive in VB.NET

I have an issue with downloading a file using FTP where I have to use KeepAlive = false otherwise I get an exception:

System.Net.WebException:"The remote server returned an error: (503) Bad sequence of commands"

Is there a way to set KeepAlive = false using the method My.Computer.Network.DownloadFile ?
jes12345Asked:
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Wayne Taylor (webtubbs)Commented:
You'll probably need to use a WebClient object, and set a header....

        Dim wc As New Net.WebClient
        wc.Headers.Set(Net.HttpRequestHeader.Connection, "Keep-Alive")
        wc.DownloadFile("ftp path", "save path")

Wayne
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jes12345Author Commented:
Thanks for the advise-will the code above set Keep-Alive to false?

Also I have found a workaround myself using System.Net.FtpWebRequest. Using this I can set the following:
Dim request As FtpWebRequest = DirectCast(WebRequest.Create(target), FtpWebRequest)
request.KeepAlive = False

However I am not quite sure what I am doing here on the first line - can you advise about this? (DirectCast etc)

Also do you know what are the difference between WebClient, WebRequest and FtpWebRequest?
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