Is it possible to have a derived field in VB6 like you can in MSAccess
eg if I have 2 fields in called A and B, in access I can then place an unbound field on my form and set the control source to =[A] + [B], and anytime I edit either field, the derived field will recalculate.

can this be done in VB?

or would you have to fire an event everytime you changed either field A or B?

VB is not a Relational Database Management System (RDBMS).

The joining of fileds, or the presenting of a calculation as a field, would be a function to the RDBMS (Oracle, SQL Server, etc.)

If the RDBMS will support it, then if you put it into the SQL you run against the RDBMS will return the desired resluts.

Oh right, cheers