In VB it is simple...
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
Select Case KeyCode
Case vbKeyF2
Call Proc_Event1
Case vbKeyF3
Call Proc_Event2
End Select
End Sub
I imagine it would not be too different in asp.net
Hope that helps
(BTW, Don't assign F1, F5 or F12)