Sales order cancellation validation through event handler X++

Hi friends, small tip, I got chancel to add validation in Cancel functionality of D365 Finance and operations.Interestingly the menu button called the class. So I have to write the pre event handler for main method.

Following is the [[Code Snippet]]

public static void SalesCancelOrder_Pre_main(XppPrePostArgs _args)
    {
     

        Args args =_args.getArg("args");
        SalesTable salesTable = args.record();
        CustmTable _Response;

        select * from _Response where _Response.PrimaryKey == salesTable.SalesId && _Response.TransType == CustmTransType::SalesOrder;
         
        if (_Response.RecId !=0)
        {
           // validateEventArgs.parmValidateResult(false);
           Error("This sales order is integrationed with wms, Cancellation is not recommended, use the cancellation dailog for Cancel in wms.");
            if (Box::yesNo("Sales order is integrated with WMS, Do you really want to cancel it.", DialogButton::No) == DialogButton::No)
            {
                throw Exception::Error;
            }
        }

       
    }