read multi selected records from grid x++

public void clicked()
{
INTC_UnitDetails        unitDetails;
MultiSelectionHelper    helper = MultiSelectionHelper::construct();
boolean                 validate;

helper.parmDatasource(INTC_UnitDetails_ds);

unitDetails = helper.getFirst();
while (unitDetails.RecId != 0)
{
if(unitDetails.WCNDate != dateNull() || unitDetails.DLNDate != dateNull())
{
validate    =   true;
info(strFmt("%1", unitDetails.RecId));
}
else
{
validate    =   false;
}
unitDetails = helper.getNext();
}
if(validate == true)
{
super();
}
else
{
warning("PCN date or DLN date should not empty");
}
}