I tried to upload data(ie.) add data to an existing file in skydrive but everytime the content has been overwriting. I want to add datas to the existing file without overwriting the previous contents.
Thanx for your help in advance
You should obtain the LiveConnect SDK, add the APIs to your project, login to the service, and upload a file to Skydrive.
Have a look over these threads. How to simply access SkyDrive, write and read files? and this one too.