title: How Can I update a row in WPF's datagrid when I 'm implementing MVVM ? ( without any Button)
body: <p>I've already made a WPF application without MVVM and I do update my rows by using some event such CellEditEnding, but Now I want to do the same thing in MVVM so I'm not going to use any event and I should do it in my ViewModel.   </p>
  
  <p>How Can I do it? ( I like a way that just updating the rows which are changed). I want to use Datagrid's feature instead of using any button such as Update button.  </p>
  
  <ul>
  <li>by the way when I done it I'll go for Full CRUD system.</li>
  </ul>