Alphanumeric Autonumber Primary Key

Hi there,
The age old question of creating a unique alphanumeric value automatically like ABC0001, ABC0002

Is it possible to do this automatically? That is, without having to update it which will slow the db down horribly?the only sane way of doing it is to have an ordinary integer identity column, then produce the alphanumeric value in a view

create view myview as
select 'ABC'+right(cast(pkey as varchar(9)),4) as myalnumkey ...