Gets or sets the name of the connection group that contains the service point used to send the current request.
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Connection groups associate a set of requests with a particular connection or set of connections. The connections in a connection group can be reused only by requests originating in the same application domain, when the credentials on the request are the same and the request specifies the connection group name. When a request does not specify a connection group name, any existing connection to the requested server that is not associated with a connection group can be used. When the credentials are not the same, the existing connection is closed and the new request must be reauthenticated.
Using connection groups can improve performance because this allows all of the requests for a user to reuse the connection authenticated with the user's credentials.
Changing the FtpWebRequest.ConnectionGroupName property after calling the FtpWebRequest.GetRequestStream, FtpWebRequest.BeginGetRequestStream(AsyncCallback, object), FtpWebRequest.GetResponse, or FtpWebRequest.BeginGetResponse(AsyncCallback, object) method causes an InvalidOperationException exception.