Cross Domain CRUD Operations Using the ADO.Net Data Service

Hello All,
I have to perform CRUD Operations on SharePoint 2013 lists, files and folders.
What I am doing is, my ADO.Net Data service is at Corpnet exposing data in XML and I am trying to Consume it using a client application which is in SharePoint 2013 on Cloud Environment.
While consuming the Service using AJAX call it was giving me Access Denied error, now i changed the client call and using SP.WebRequestInfo(); method object, however it is giving me an error that Object doesn't support this action.
Can anybody please let me know how to solve this error ? Or if there is any other way to perform CROSS(Cloud to Corpnet) Domain CRUD operations then let me know ?
Thanks in advance,
Sushil Sahu