/// <summary>
        /// Main entry point for handling a user operation
        /// </summary>
        /// <param name="portal">DevicePortal reference for communicating with the device.</param>
        /// <param name="parameters">Parsed command line parameters.</param>
        public static void HandleOperation(DevicePortal portal, ParameterHelper parameters)
        {
            if (parameters.HasFlag(ParameterHelper.HelpFlag))
            {
                Console.WriteLine(XblUserUsageMessage);
                return;
            }

            string operationType = parameters.GetParameterValue("subop");

            if (string.IsNullOrWhiteSpace(operationType))
            {
                Console.WriteLine("Missing subop parameter");
                Console.WriteLine();
                Console.WriteLine(XblUserUsageMessage);
                return;
            }

            operationType = operationType.ToLowerInvariant();

            if (operationType.Equals("list"))
            {
                Task <UserList> getUsers = portal.GetXboxLiveUsers();

                getUsers.Wait();
                Console.WriteLine(getUsers.Result);
            }
            else if (operationType.Equals("addsponsored"))
            {
                UserInfo user = new UserInfo();

                user.SponsoredUser = true;
                user.SignedIn      = true;

                UserList userList = new UserList();
                userList.Add(user);

                UpdateXboxLiveUsers(portal, userList);
            }
            else if (operationType.Equals("signin") || operationType.Equals("signout") || operationType.Equals("delete") || operationType.Equals("autosignin"))
            {
                UserInfo user = new UserInfo();

                if (parameters.HasParameter("id"))
                {
                    uint userId = 0;
                    if (!uint.TryParse(parameters.GetParameterValue("id"), out userId))
                    {
                        Console.WriteLine(string.Format("Failed to parse id to an unsigned integer: {0}", parameters.GetParameterValue("id")));
                        return;
                    }

                    user.UserId = userId;
                }
                else
                {
                    user.EmailAddress = parameters.GetParameterValue("msa");

                    if (user.EmailAddress == null)
                    {
                        Console.WriteLine("Must provide either msa or id to this operation");
                        Console.WriteLine();
                        Console.WriteLine(XblUserUsageMessage);
                        return;
                    }
                }

                if (operationType.Equals("signin"))
                {
                    // Optional password (only used on first signin)
                    user.Password = parameters.GetParameterValue("msapwd");

                    user.SignedIn = true;
                }
                else if (operationType.Equals("signout"))
                {
                    user.SignedIn = false;
                }
                else if (operationType.Equals("delete"))
                {
                    user.Delete = true;
                }
                else if (operationType.Equals("autosignin"))
                {
                    if (parameters.HasFlag("on"))
                    {
                        user.AutoSignIn = true;
                    }
                    else if (parameters.HasFlag("off"))
                    {
                        user.AutoSignIn = false;
                    }
                    else
                    {
                        Console.WriteLine("autosignin operation requires the state (/on or /off).");
                        Console.WriteLine();
                        Console.WriteLine(XblUserUsageMessage);
                        return;
                    }
                }

                UserList userList = new UserList();
                userList.Add(user);

                UpdateXboxLiveUsers(portal, userList);
            }
            else
            {
                Console.WriteLine(string.Format("Unrecognized subop: {0}", operationType));
                Console.WriteLine();
                Console.WriteLine(XblUserUsageMessage);
                return;
            }
        }