LiveCodingChat.Xmpp.Room.UserJoined C# (CSharp) Method

        public void UserJoined(string id,User user)
        {
            Users.Add(id, user);
            if (UserStateChanged != null)
                UserStateChanged(this,user,UserState.Available);
        }

        private void XMPP_Presence(XmlElement element)
        {
            if (element.Attributes.GetNamedItem("to").Value == JID)
            {
                string[] frm    = element.Attributes.GetNamedItem("from").Value.Split('/');
                string   roomId = frm[0];
                string   userId = frm[1];
                string   type   = getValue(element.Attributes.GetNamedItem("type"));

                if (Rooms.ContainsKey(frm [0]))
                {
                    Room room = Rooms [roomId];
                    User user;
                    if (type == "available" || type == null)
                    {
                        if (room.Users.ContainsKey(userId))
                        {
                            user = room.Users[userId];
                        }
                        else
                        {
                            room.UserJoined(userId, user = new User(userId));
                        }

                        //room.SendMessage("Willkommen test", user);

                        foreach (XmlElement el in element.ChildNodes)
                        {
                            if (el.Name == "x" && el.FirstChild.Name == "item")
                            {
                                string affiliation = getValue(el.FirstChild.Attributes.GetNamedItem("admin"));
                                string role        = getValue(el.FirstChild.Attributes.GetNamedItem("role"));
                                string premium     = getValue(el.FirstChild.Attributes.GetNamedItem("premium"));
                                string staff       = getValue(el.FirstChild.Attributes.GetNamedItem("staff"));
                                string color       = getValue(el.FirstChild.Attributes.GetNamedItem("color"));
                                user.Affiliation = affiliation ?? user.Affiliation;
                                user.Role        = role ?? user.Role;
                                user.Premium     = premium == null ? user.Premium : bool.Parse(premium);
                                user.Staff       = staff == null ? user.Staff : bool.Parse(staff);
                                user.Color       = color == null ? user.Color : System.Drawing.Color.FromArgb(Convert.ToInt32("ff" + color.Substring(1), 16));
                            }
                        }
                    }
                    else if (type == "unavailable")
                    {
                        room.UserLeft(userId);
                    }
                }
            }
        }