How to get edited record values in save action in datatable binding?

       [AcceptVerbs(HttpVerbs.Post)]

        public ActionResult saveAction(FormCollection collection)

        {

            string ColName = HttpContext.Request.Form.AllKeys[8]; /* you can get all the key values from HttpContext */

            DataTable table1 = GetDatatable();

            table1.Rows.Find(Convert.ToDecimal(collection["OrderID"])).SetField("ShipCity", Convert.ToString(collection["ShipCity"]));

            table1.Rows.Find(Convert.ToDecimal(collection["OrderID"])).SetField("ShipAddress", Convert.ToString(collection["ShipAddress"]));

            table1.AcceptChanges();

            return table1.AsEnumerable().Take(50).GridJSONActions<System.Data.DataRow>();

        }