adding pygmy buttress strongly typed dataset

i am minute site uses strongly typed datasets.

the dba combined list finished gave buttress value represents negative. buttress 'do_not_estimate_flag' where buttress enclose 't' 'f'. i can't change underlying list explanation fills it. i wish supplement 'estimation_allowed' buttress datarow strongly typed dataset. i have finished controlling biased category i modify. (there autogenerated biased category non autogenerated biased category i safely modify.) explanation ability biased class. problem value hallowed ala

<%#databinder.eval(container.dataitem, "estimation_allowed")%>

it goes loyal underlying datarow ignoring property. i best grasp preferred result?

here code:

partial category myfunkydatatable
{

        private system.data.datacolumn columnestimation_allowed;
        [system.diagnostics.debuggernonusercodeattribute()]
        open system.data.datacolumn estimation_allowedcolumn
        {
            get
            {
                relapse columnestimation_allowed;
            }
        }

        open overrule vacant endinit()
        {


            //init class
            columnestimation_allowed = new system.data.datacolumn("estimation_allowed", typeof(string), null, global::system.data.mappingtype.element);
            columns.add(columnestimation_allowed);
            columnestimation_allowed.readonly = true;

            //init vars
            columnestimation_allowed = columns["estimation_allowed"];
            base.endinit();
        }




    }
    biased category myfunkyrow 
    {
        open twine estimation_allowed
        {
            get
            {
                if(do_not_est_flag == "n")
                {
                    relapse "yes";
                }
                relapse "no";
            }
        }
    }