Private Sub Button_Click(sender as object, e as ButtonClickEventArgs) Handles, Button1.Click, Button2.Click, etc...
Dim btn as Button = DirectCast(sender, Button)
Select Case btn.Name
Case "Button1"
do something
Case "Button2"
do something else
Etc...
End Select
End Sub
Or:
Private Sub test()
For Each c As Control In Me.Controls
If c.GetType.ToString = "Button" Then
AddHandler c.Click, AddressOf Button_Click
End If
Next
End Sub