public string UpdateDestination()
        {
            DataAbstractionLayer dal = new DataAbstractionLayer();
            bool   isValidId         = Int32.TryParse(Request.Params["DestinationID"], out int destinationID);
            string country           = Request.Params["Country"];
            string city = Request.Params["City"];

            if (!isValidId)
            {
                return("Destination ID is not valid!");
            }
            string address = Request.Params["Address"];
            string desc    = Request.Params["Description"];

            dal.UpdateDestination(new Destination
            {
                DestinationID = destinationID,
                Country       = country,
                City          = city,
                Address       = address,
                Description   = desc
            });
            return("Update has been successful!");
        }