List<TcpClient> tcpClients = new List<TcpClient>(htUsers.Values);

            foreach (var user in tcpClients)
            {
                swSender = new StreamWriter(tcpClients.GetStream());
            }



System.Collections.Generic.List<System.Net.Sockets.TcpClient>' does not contain a definition for 'GetStream' and no extension method 'GetStream' accepting a first argument of type 'System.Collections.Generic.List<System.Net.Sockets.TcpClient>' could be found (are you missing a using directive or an assembly reference?).