How to perform GridView instant updating using different editors in the DataItem template

UPDATED:

Starting with version 13.2, the GridView control offers the basic "Batch Editing Mode" functionality that allows accomplishing a similar task with less effort and does not require so much extra code. See the ASP.NET WebForms & MVC: GridView Batch Edit blog post to learn more about this new functionality.
Starting with version 14.1, the GridView control offers advanced "Batch Editing Mode" programming options.

You can find a standalone DB-independent solution in our Code Examples base at:
GridView - A simple Batch Editing implementation 

If you have version v14.1+ available, consider using the built-in functionality instead of the approach detailed below.
If you need further assistance with this functionality, please create a new ticket in our Support Center.

The example illustrates a functionality similar to that demonstrated in the How to perform ASPxGridView instant updating using different editors in the DataItem template example.
When a user types a value, the editor raises the client-side ASPxClientEdit.ValueChanged event. In the event handler, it is possible to get a value from the editor and send it to the server using jQuery.ajax method.

See Also:
Video: ASP.NET MVC GridView - How To Setup Multi-Row and Instant Updates
GridView - How to implement batch update using the Ajax request
How to implement the multi-row editing feature in the GridView