Update Database field using ASP.Net DropDownList in Edit ItemTemplate of GridView

http://www.aspsnippets.com/Articles/How-to-populate-DropDownList-in-GridView-in-ASPNet.aspx

i read the above article that was really great.

but i wanted know,how to update the country of any customer by just choosing it from the dropdownlist and updating it in the databse.

i  wanted to add a common update below that updated the country of customers.

please Mudassar Ahmed Khan sir please help me in finding a solution.

Thanks

prince