Note that one method can handle as many events as you like, providing the signature is the same for each event. That means that the argument lists must match. If you want to execute the same code on more than one event with different signatures you'd have to do this:
VB Code:
Private Sub ComboBox1_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.Leave
Me.DoSomething()
End Sub
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
Me.DoSomething()
End Sub
Private Sub DoSomething()
'Place code here.
End Sub