When clicking on the button in the form I need to reset the field in the table 
this code in class I created 
I need to add code in while to reset field in the table
[FormControlEventHandler(formControlStr(ProdParmReportFinished, SHG_ResetGoodQty), FormControlEventType::Clicked)]
    public static void SHG_ResetGoodQty_OnClicked(FormControl sender, FormControlEventArgs e)
    {
        FormRun formRun=  sender.formRun();
        FormDataSource ProdParmReportFinished_DS = formRun.DataSource("ProdParmReportFinished");
        ProdParmReportFinished  ProdParmReportFinished = ProdParmReportFinished_DS.getFirst() as ProdParmReportFinished;
        while(ProdParmReportFinished)
        {
        }
        ProdParmReportFinished_DS.refresh();
        ProdParmReportFinished_DS.reread();        
    }