public Leave(User sender, string message, Chatroom chatroom, bool doBroadcast) : base(sender, message, chatroom, doBroadcast) { }
public Management(User sender,User recipient,Chatroom Mgmt_Chatroom,List<Chatroom> Chatrooms) : base(sender,string.Empty,Mgmt_Chatroom,false) { this.Chatrooms = Chatrooms; this.recipient = recipient; }