asp.net mvc - Stored procedures with output parameters using SqlQuery in the DbContext API -

i coulndt return output parameter query,here codes

  etentities en = new etentities();              var prm_totalrecords = new sqlparameter            {                parametername = "totalrow",                  sqldbtype=system.data.sqldbtype.int                  ,direction= parameterdirection.output             };             var prm_start = new sqlparameter            {                parametername = "page",                value = start,                sqldbtype=system.data.sqldbtype.int             };            var prm_sort= new sqlparameter            {                parametername = "msort",                sqldbtype = system.data.sqldbtype.nvarchar,                value = sort             };            var prm_limit = new sqlparameter            {                parametername = "size",                sqldbtype = system.data.sqldbtype.int,                value = limit             };              string sql = "sp_product_get_paging @size,@page,@msort,@totalrow out";            object[] parameters = new object[] { prm_limit,prm_start,prm_sort,prm_totalrecords};            var data = en.database.sqlquery<urun>(sql,parameters);           // totalrecords = (int)prm_totalrecords.value;//here give null error            totalrecords = 3;         return data; 

everrything work fine if set 3 totalrecords manually,but part gives me null error. totalrecords = (int)prm_totalrecords.value; how can return value ,thank