jQuery Grid Plugin - jqGrid

Hi

I'm trying to use form editing with json data retrieved from a url. data is populated successfully and changes are sent to the editurl, But changes are not saved client side. should I reload data after each edit? this is my jqgrid part

jQuery("#extension_grid").jqGrid({

url: '/Extension/Report',

datatype: "json",

direction: "rtl",

height: "auto",

jsonReader: { root: "rows", page: "page", total: "total", records: "records", repeatitems: false, userdata: "UserData" },

colModel:

[

{ name: 'id', index: 'id', label: 'داخلي', key: true,sorttype: 'int', width: 300 },

{ name: 'assigned_user', index:'ext', label: 'داخلي',editable:true,sorttype:'int' , width: 300 }

],

pager: '#extension_pager',

sortname: 'id',

viewrecords: true,

sortorder: "asc",

caption: "داخلي‌ها",

editurl: '/Extension/MyEdit'

//editurl: 'clientArray'

});

jQuery("#extension_grid").jqGrid('navGrid', '#extension_pager', { edit: true, add: true, del: true }, {closeAfterEdit:true}, null, null, { multipleSearch: true });

thanx