In a thread here:
http://www.llblgen.com/tinyforum/Messages.aspx?ThreadID=3503&HighLight=1
Otis mentions operator overloading being made simpler in the new version of LLBLGen (This was back in 2005)
What's the best way to do this in LLBLGen Pro 2.0:
// Fields
ResultsetFields fields = new ResultsetFields(2);
fields.DefineField(VehiclesFieldIndex.VehicleId, 0, "VehicleId");
fields.DefineField(VehiclesFieldIndex.Model, 1, "VehicleFullname");
Expression modelExp = new Expression(" ", ExOp.Add, EntityFieldFactory.Create(VehiclesFieldIndex.Model));
Expression fullExp = new Expression(EntityFieldFactory.Create(ManufacturersFieldIndex.Name), ExOp.Add, modelExp);
fields[1].ExpressionToApply = fullExp;
(Code taken from the linked article. I'm using VB.NET 2005 with self servicing but I'm sure the code will be about the same for either language.