AutoMapper - mapping datatable to class object using customtype converter

I'm new to AutoMapper and have couple of questions regarding datatable to object mapping.I did some work but seems like something went wrong.

Mapper.CreateMap<IDataReader, OrderDest>().ConvertUsing<OrderDestTypeConverter>();

public class OrderDestTypeConverter : ITypeConverter<IDataReader, OrderDest>
    {
        public OrderDest Convert(ResolutionContext context)
        {
            var dest = new OrderDest();
            if (!context.IsSourceValueNull && context.SourceValue is IDataReader)
            {
                var dr = (IDataReader) context.SourceValue;
                dest.OrderQuantityDest = (int) dr["quantity"];
            }
            return dest;
        }
    }

In my repository class - I'm doing this

  var crs = new CustomerRespositorySimulator();
  DataTable orderlistsource = crs.GetCustomerOrders(12345);
  var orderlistdest = Mapper.Map<IDataReader, List<OrderDest>>(orderlistsource.CreateDataReader());

For some reason the mapping does not work . I even attached a break in custom type converter OrderDestTypeConverter class and it never gets hit.

I'm doing any wrong in using customtype converter?.

Appreciate your help!.