Gets or sets a bool value that specifies whether the control connection to the FTP server is closed after the request completes.
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When the FtpWebRequest.KeepAlive property is set to false, the control connection is closed when you call the FtpWebResponse.Close method.
Changing FtpWebRequest.KeepAlive after calling the FtpWebRequest.GetRequestStream, FtpWebRequest.BeginGetRequestStream(AsyncCallback, object), FtpWebRequest.GetResponse, or FtpWebRequest.BeginGetResponse(AsyncCallback, object) method causes an InvalidOperationException exception.