//Get all categories
public IEnumerable <CategoryViewModel> GetAll()
{
IEnumerable <CategoryDTO> phoneDtos = auctionService.GetAllCategories();
var mapper = new MapperConfiguration(cfg => cfg.CreateMap <CategoryDTO, CategoryViewModel>()).CreateMapper();
var categories = mapper.Map <IEnumerable <CategoryDTO>, List <CategoryViewModel> >(phoneDtos);
return(categories);
}