title: How to raise event when Current application property is changed
body: <p>I have a WPF application.</p>
  
  <p>In my App.xaml.cs I save the full name of the logged in user as follows:</p>
  
  <p>App.Current.Properties["FullName"] = GetValueFromDatabase();</p>
  
  <p>I have two screens/windows in the same application.</p>
  
  <p>First is the users scrren, which has a an editable WPF data grid where I can update full name of the current  user. 
    Second is a screen which has a Label/TextBox control which displays the Current users fullname from the Application object. </p>
  
  <p>When both the windows are open, if I change the full name of the user and save the changes in the first screen. I want to trigger an event so that, it is also reflected in the second screen immediately?</p>
  
  <p>Which event do I hook to this application and how?</p>
  
  <p>I am using MVVM pattern and entity framework.</p>