Do i need to create automapper createmap both ways?

Question

This might be a stupid question! (n00b to AutoMapper and time-short!)

I want to use AutoMapper to map from EF4 entities to ViewModel classes.

1) If I call

<

Answer 1

I've used an extension method do mapping both ways

    public static IMappingExpression BothWays
        (this IMappingExpression mappingExpression)
    {
        return Mapper.CreateMap();
    }

usage:

 CreateMap().BothWays();