Bulk Edit with GridView without xxxDataSource (SqlDataSource, ObjectDataSource, etc.)

I'm an Italian Software Developer from about 15 years.
I worked a long time in south Italy (where I was born) and after 2 years in Milan and an year in UK, I'm working remotely from Italy as Senior ASP.NET C# Developer using ASP.NET Ajax technology for a UK company.
 
Check out my personal blog:
http://megasoft78.wordpress.com/
 
and my first Android game (Fifteen Puzzle X):
https://play.google.com/store/apps/details?id=it.megasoft78.fifteenpuzzlex