How to dynamically check/uncheck a check box

i wrote code create textbox , put x or empty behave checkbox.

            formapp = new aformapp();
            myfields = formapp.fields;
            myenumerator = myfields.getenumerator();
            while (myenumerator.movenext())
            {
                myfield = (ifield)myenumerator.current;
                if (myfield.name=="txt1testresults")
                            myfield.value = "x";
        }

this works text box in putting x it.

 

now im trying directly use check box , dynamically set checked or unchecked

 

so instead of myfield.value, there myfield.check or myfield.uncheck

 

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