How to Map String Literal to Destination Property
Solution 1:
Mapper.CreateMap<Source, Destination>()
.ForMember(dest => dest.Member, opt => opt.UseValue<string>("THIS STRING"));
Starting with version 8.0 you have to use the following:
Mapper.CreateMap<Source, Destination>()
.ForMember(dest => dest.Member, opt => opt.MapFrom(src => "THIS STRING"));