Create Dialog in D365

class simpledialog extends RunBaseBatch
{
    DialogField     fieldfromDate;
    DialogField     fieldtoDate;

    TransDate       fromDate,toDate;   

    #DEFINE.CurrentVersion(1)
    #LOCALMACRO.CurrentList
        fromDate,toDate
    #ENDMACRO



    // pack() and unpack() methods are used to load the last value from user
    public container pack()
    {
    return [#CurrentVersion,#CurrentList];
    }

    public boolean unpack(container _packedClass)
    {
    int version = conpeek(_packedClass, 1);

    switch (version)
    {
        case #CurrentVersion:
            [version,#CurrentList] = _packedClass;
            break;
        default :
            return false;
    }

    return true;
}

    public Object dialog()
    {
        Dialog dialog;
        dialog = super();

        // Set a title for dialog
        dialog.caption( 'Purchase Order creation for Out Grower');

        // Add a new field to Dialog
        fieldfromDate = dialog.addField(extendedTypeStr(TransDate), 'From Date');
        fieldtoDate   = dialog.addField(extendedTypeStr(TransDate), 'To Date');

        return dialog;
    }

    boolean validate(Object _calledFrom = null)
    {
        boolean ret;

        ret = super(_calledFrom);
     
        if(fromDate > toDate)
         {
            ret = checkFailed('To Date should be greater than From Date') && ret;
         }
     
        return ret;
    }

    public TransDate parmfromDate(TransDate _fromdate = fromDate)
    {
    fromDate = _fromdate;

    return fromDate;
    }

    public TransDate parmtoDate(TransDate _todate = toDate)
    {
    toDate = _todate;

    return toDate;
    }

    public boolean getFromDialog()
    {
        fromDate = fieldfromDate.value();
        toDate = fieldtoDate.value();     

        return super();
    }

    public void run()
    {
       //your Logic 
    }

    public static void main(Args _args)
    {
        simpledialog   simple = new  simpledialog ();

        // Prompt the dialog, if user clicks OK it returns true
        if (simple .prompt())
        {
            simple .run();
        }
    }

   }