Lock or Disable a text field in d365 form in X++

Hi,

Lock or Disable a text field in d365 form in X++

 [FormControlEventHandler(formControlStr(PurchTable, Cdetail), FormControlEventType::GotFocus)]

    public static void Cdetail_OnGotFocus(FormControl sender, FormControlEventArgs e)

    {

        FormControl   callerStr = sender as FormControl;  

        FormRun form = callerStr.formRun(); /

      //Disable the text field  if data is already exists

        

        FormStringControl Cdetail = form.design(0).controlName("Cdetail");

        

        if(Cdetail.text())

        {

            Cdetail.allowEdit(false);

            Cdetail.lock();

        }

        else if(!Cdetail.text())

        {

            Cdetail.allowEdit(true );

        }

        //Disable the text field  if data is already exists

    }