title: Updating wpf parent window after some action on another window
body: <p>i have one wpf window called usermanagement and there is a listbox showing all the users, i have one button in usermanagement window called add user and when i click on that new window opens called adduser, in this window there are input fields to add new user, what i need when i save data and this adduser window close then the usermanagement window update the listbox, means users again update (the new added user should show there after adding). at the moment i needed to open the usermanagement window again to see the new added user. Thanks!</p>
  
  <p>here is the code below</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.Windows;
  using System.Windows.Controls;
  using System.Windows.Data;
  using System.Windows.Documents;
  using System.Windows.Input;
  using System.Windows.Media;
  using System.Windows.Media.Imaging;
  using System.Windows.Shapes;
  using System.Collections;
  using Model;
  
  namespace Views
  {
      /// &lt;summary&gt;
      /// Interaction logic for frmUserManagement.xaml
      /// &lt;/summary&gt;
  
      public partial class frmUserManagement : Window 
      {
          public frmUserManagement()
          {
              InitializeComponent();
          }
          public void window_loaded(object sender, RoutedEventArgs e)
          {
              load_users();
          }
          public void load_users()
          {
              RST_DBDataContext conn = new RST_DBDataContext();
              var users = (from s in conn.TblUsers
                           select s.UserName).ToList();
              Login_Names.ItemsSource = users;
          }
          private void add_user(object sender, RoutedEventArgs e)
          {
              adduser AddUserWindow = new adduser();
              AddUserWindow.ShowDialog();
          }
  
  
      }
  }
  </code></pre>
  
  <p>in xaml file there is </p>
  
  <pre><code>&lt;Grid&gt;
          &lt;ListBox Name="Login_Names" HorizontalAlignment="Left" Height="337" Margin="10,47,0,0" Padding="0,0,0,0" VerticalAlignment="Top" Width="156"&gt;
  &lt;Button Content="Add" HorizontalAlignment="Left" Margin="10,404,0,0" VerticalAlignment="Top" Width="75" Click="add_user"/&gt;
  &lt;/Grid&gt;
  </code></pre>