Hello,
>>I want to create a windows phone 8 app ,it working both offline and online
For this kind application, an import pattern is how to sync data between your client and the service, for how to implement this pattern, you could have a check this link:
https://msdn.microsoft.com/en-us/library/hh821017.aspx?f=255&MSPPError=-2147217396
It provides scenarios about:
1.How to use a periodic task to download data from a cloud service to a Windows Phone device, in the background.
2.How to use a resource-intensive task to upload data from a Windows Phone device to a cloud service, in the background.
3.How to use reactive extensions to run synchronization tasks asynchronously and in parallel.
For the service, you could have a try the azure and here is link which provides a completed example about your requested scenario: when offline, your client app uses your local database data, and when online, the cloud service helps
sync the data between your local and cloud side:
Using offline data sync in Mobile Services
In this link, it would show you how Azure Mobile Services offline features allow you to interact with a local database when you are in an offline scenario with your Mobile Service. The offline features allow you to sync your local changes with the mobile
service when you are online again.
Regards.
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