title: With WPF/MVVM detect textbox change on save
body: <p>Using WPF &amp; MVVM with entity data model, I am trying to detect when any one of my six textboxes have changed when clicking the save button.  I want to save all changes which work fine, but I also am updating a grid elsewhere in the view, only if one of those textboxes have changed.</p>
  
  <p>I am new to wpf and not sure what approach to take.  Do I use something like UpdateSourceTrigger in the propery of the textbox in the xaml or use validation...or something  else?  And whatever the best way, could you please explain how/why?</p>
  
  <p>Thanks for any help</p>