string ctrlName = ((Control)sender).Name;

ref: https://social.msdn.microsoft.com/Forums/windows/en-US/1c5243d0-6f6d-434d-894f-337f266ebcfa/in-cnet-how-to-get-current-control-name?forum=winforms

string ctrlName = ((Control)sender).Name;

In C#.NET How to get Current Control Name https://t.co/2pf8byO2RI

— 「เลาเองเลาไงมีไลล๋อ」#COYG ⚽ (@sornram9254) December 11, 2015