Refresh mainWindow Datagrid after closing popup childWindow

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

"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">
"menu1" >
"Expenses" x:Name="typeExpense" Click="typeExpense_Click"/>
"Main" NavigationUIVisibility="Hidden" Margin="0,35,0,0">

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:

"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">
"btnAdd" Content="Dobavit" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="50,45,0,0" Click="btnAddWindow_Click"/>
"dataGrid" AutoGenerateColumns="False" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,100,10,10">
"Naimenovaniya" Binding="{Binding Path=typename}" Width="300"/>

Type Code Behind:

using System.Windows;
using System.Windows.Controls;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
namespace MyAccount
{
///
/// Interaction logic for Type.xaml
///
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:

"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">
"label" Content="Naimenovaniya" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="35,0,0,0"/>
"txtType" HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="364" Margin="45,26,0,0"/>
"btnOK" Content="OK" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="85,77,0,0" Click="btnOK_Click"/>
"btnCancel" Content="Otmena" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="219,77,0,0" Click="btnCancel_Click"/>

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();
}
}
}