If you have questions on the System.Net [managed network programming api's]please post your questions to http://forums.microsoft.com/msdn/ShowForum.aspx?ForumID=40
I monitor this forum and so does all of my team. This is your best bet to get your questions answered. There might be other public news groups, but we are not monitoring those actively. Please use the forum above.A few tips for getting your questions answered
Good Luck and thanks for posting your questions.