public static IMappingExpression<TSource, TDestination> IgnoreAllNonExisting<TSource, TDestination>(this IMappingExpression<TSource, TDestination> expression)
        {
            foreach (var property in expression.TypeMap.GetUnmappedPropertyNames())
            {
                expression.ForMember(property, a => a.Ignore());
            }
            return expression;
        }

 public class UserProfile : Profile
    {
        protected override void Configure()
        {
            
            CreateMap<RegisterViewModel, ApplicationUser>()
                .IgnoreAllNonExisting();
               
        }

        public override string ProfileName
        {
            get { return this.GetType().Name; }
        }
    }