Refresh mainWindow Datagrid after closing popup childWindow

Question

I have a wpf MainWindow.xaml. The MainWindow includes a navigation page Type.xaml. And the navigation page has dataGrid and a popup Window AddType.xaml. Now I want the MainWindow to be refreshed after I close the popup Window. Below is my code:

 

 MainWindow.xaml

 

<Window x:Class="MyAccount.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MyAccount"
        mc:Ignorable="d"
        Title="My personal budget" Height="700" Width="1200" WindowStartupLocation="CenterScreen">
    <Grid>
        <StackPanel>
            <Menu Name="menu1" >
                <MenuItem Header="Expenses" x:Name="typeExpense" Click="typeExpense_Click"/>
            </Menu>
           </StackPanel>
        <Frame Name="Main" NavigationUIVisibility="Hidden" Margin="0,35,0,0">
        </Frame>
    </Grid>
</Window>

 MainWindow CodeBehind:

using System.Windows;

namespace MyAccount
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void typeExpense_Click(object sender, RoutedEventArgs e)
        {
            Type type = new Type();
            Main.NavigationService.Navigate(type);
        }
    }
}

Type.xaml:

<Page x:Class="MyAccount.Type"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:local="clr-namespace:MyAccount"
      mc:Ignorable="d"
      d:DesignHeight="650" d:DesignWidth="1150"
      Title="Type">
    <Grid>
        <Button x:Name="btnAdd" Content="Dobavit" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="50,45,0,0" Click="btnAddWindow_Click"/>
        <DataGrid x:Name="dataGrid"  AutoGenerateColumns="False" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,100,10,10">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Naimenovaniya" Binding="{Binding Path=typename}"  Width="300"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Page>

Type Code Behind:

using System.Windows;
using System.Windows.Controls;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;

namespace MyAccount
{
    /// <summary>
    /// Interaction logic for Type.xaml
    /// </summary>
    public partial class Type : Page
    {
        string connection = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
        public Type()
        {
            InitializeComponent();
            DataGridBind();
        }
        protected void DataGridBind()
        {
            SqlConnection con = new SqlConnection(connection);
            con.Open();
            SqlCommand cmd = new SqlCommand("SELECT * from type", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGrid.ItemsSource = dt.DefaultView;
        }

        private void btnAddWindow_Click(object sender, RoutedEventArgs e)
        {
            AddType addtype = new AddType();
            addtype.Show();
        }
    }
}

AddType.xaml:

<Window x:Class="MyAccount.AddType"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MyAccount"
        mc:Ignorable="d"
        Title="Dobavit kategorii" Height="200" Width="500">
    <Grid>
        <Label x:Name="label" Content="Naimenovaniya" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="35,0,0,0"/>
        <TextBox x:Name="txtType" HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="364" Margin="45,26,0,0"/>
        <Button x:Name="btnOK" Content="OK" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="85,77,0,0" Click="btnOK_Click"/>
        <Button x:Name="btnCancel" Content="Otmena" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="219,77,0,0" Click="btnCancel_Click"/>

    </Grid>
</Window>

AddType CodeBehind

 

using System.Configuration;
using System.Data.SqlClient;
using System.Windows;

namespace MyAccount
{
    public partial class AddType : Window
    {
        string connection = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
        public AddType()
        {
            InitializeComponent();
        }

        private void btnOK_Click(object sender, RoutedEventArgs e)
        {
            SqlConnection con = new SqlConnection(connection);
            con.Open();
            SqlCommand cmd = new SqlCommand("INSERT INTO type (typename) VALUES ('"+txtType.Text+"')", con);
            cmd.ExecuteNonQuery();
            con.Close();
            Close();
        }

        private void btnCancel_Click(object sender, RoutedEventArgs e)
        {
            Close();
        }

    }
}