Prism for Silverlight/MEF in Easy Samples. Part 3 - Communication between the Modules

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel.Composition;
using Microsoft.Practices.Prism.Regions;
using System.ComponentModel;
using Microsoft.Practices.Prism;

namespace Module1
{
    [Export]
    public partial class Module1View : UserControl
    {
        public Module1View()
        {
            InitializeComponent();

            // get the region context from the current view 
            // (which is plugged into the region)
            Microsoft.Practices.Prism.ObservableObject<object> regionContext = 
                RegionContext.GetObservableContext(this);

            // set an event handler to run when PropertyChanged event is fired
            regionContext.PropertyChanged += regionContext_PropertyChanged;
        }

        void regionContext_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            // if region context's Value property changed assing the text block's text property
            // the value from region context's Value property
            if (e.PropertyName == "Value")
            {
                ObservableObject<object> obj = (ObservableObject<object>)sender;

                CopiedTextTextBlock.Text = (string) obj.Value;
            }
        }
    }
}