c# - Automapper not mapping different property names -

i have dto class called cardatadto 2 properties named below:

 public decimal fueltanksize { get; set; }  public decimal carengineoutput { get; set; } 

i using dapper , can see data getting returned , mapped properties in dto expected.

i using webapi return data ui - properties on ui named differently below in class called cardata

 public decimal size { get; set; }  public decimal engineoutput { get; set; } 

so attempting use automapper map these properties below - have automapper config class initialize method called in application_start in global.asax.cs

config.createmap<cardata, cardatadto>()       .formember(dest => dest.fueltanksize, opt => opt.mapfrom(src => src.size))       .formember(dest => dest.carengineoutput, opt => opt.mapfrom(src => src.engineoutput))       .reversemap(); 

i getting data in webapi method db list of data , returning below:

var cardata = _myservice.getallcardata().tolist(); //error checking etc removed brevity return mapper.map<ienumerable<cardatadto>, ienumerable<cardata>>(cardata); 

with breakpoint set on cardata line can see fueltanksize , carengineoutput have values db expected - when run in postman values size , engineoutput 0