c# - How can I know which method called event handler -

i have 2 methods:

private void rvlisten_opt()  private void rvlisten_fut() 

on event, both call:

void onrvmessagereceived(object sender, sigrvmessageeventargs args) 

when onrvmessagereceived called, how can check of 2 methods called it? know can done using object sender, i'm not sure how it.

if can edit sigrvmessageeventargs class add field set differently in 2 calls.