Personally I avoid underscores anyway -,they make long sql statements hard on my eyes. I prefer camel case
Another vote for camel case. Also, IMO it's best to use a less ambiguous naming convention. ALL my form controls are prefixed per type (e.g. cmb is combo) so there's never any doubt if a reference is a control or not. FWIW, .Value isn't even required as it's the default property of all (?) controls.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.