private async System.Threading.Tasks.Task InviteUser()
        {
            if (!HasErrors)
            {
                if (ProjectUsers.Any(nav => nav.EMail == NewUserEmail) || AllCompanyUsers.Any(nav => nav.EMail == NewUserEmail))
                {
                    ChangeNotification.Raise(new Notification
                    {
                        Title   = Properties.Resources.User_Invitation_Exists_Title,
                        Content = string.Format(Properties.Resources.User_Invitation_Exists_Content, NewUserEmail)
                    });
                }
                else
                {
                    try
                    {
                        User newUser = await adminService.InviteNewUserAsync(NewUserEmail, SelectedProject, globalModel.CurrentUser);

                        ProjectUsers.Add(mapper.Map <ProjectUser>(newUser));
                    }
                    catch (TimeoutException timeoutEx)
                    {
                        _eventAggregator.GetEvent <TimeoutErrorEvent>().Publish(timeoutEx);
                    }
                }
            }
        }