Selamat siang, Kebetulan saya lagi belajar develop asp.net c# dengan mengimplementasikan Extjs 4.2.1 kedalam ny, saya lagi dapat masalah
Data Grid saya tidak meload data
berikut response dari function LoadData dari database yg saya buat
{"data":
"[{\"devicegroupcode\""IRD\",\"devicegroupname\""IRD\",\"createddate\""\\/Date(-2209014000000)\\/\",\"createduser\""\",\"amendeddate\""\\/Date(-2209014000000)\\/\",\"amendeduser\""\"},{\"devicegroupcode\""SFG\",\"devicegroupname\""SEMI FG\",\"createddate\""\\/Date(-2209014000000)\\/\",\"createduser\""\",\"amendeddate\""\\/Date(-2209014000000)\\/\",\"amendeduser\""\"},{\"devicegroupcode\""TPS\",\"devicegroupname\""TPS\",\"createddate\""\\/Date(-2209014000000)\\/\",\"createduser\""\",\"amendeddate\""\\/Date(-2209014000000)\\/\",\"amendeduser\""\"}]"
,"totalCount":3}

DataStore saya
Ext.define('DeviceGroup',{
extend: 'Ext.data.Model',
fields: [
{ name: 'devicegroupcode', type: 'string' },
{ name: 'devicegroupname', type: 'string' },
{ name: 'createddate', type: 'string' },
{ name: 'createduser', type: 'string' },
{ name: 'amendeddate', type: 'string' },
{ name: 'amendeduser', type: 'string' }
],
proxy: {
type: 'ajax',
url: '/DeviceGroup/LoadData',
reader: {
type: 'json',
rootProperty: 'data',
totalProperty: 'totalCount'
},
writer: {
type: 'json',
root: 'data'
},
actionMethods: {
create: 'POST', read: 'POST', update: 'POST', destroy: 'POST'
}
}
});
var storeDeviceGroup = Ext.create('Ext.data.Store', {
model: 'DeviceGroup',
autoLoad: true,
pageSize: 20
});

Apakah ada yang salah ketika saya membuat datastore ini ?