upload file in 4shared using rest api in windows phone

See more:

C#

C#4.0

Hi,
I am working on a win phone app. I have to perform all crud operation of rest api on 4shared.com. I am working on updating file info (name and description). I tried to perform put in 4shared api console by passing parameters and also get file response. But information is not updated one it was the same old values.
I am using like this
http://api.4shared.com/v0/files/id.json?oauth_token=value&name=mayank&description=testing

content-type:application/x-www-form-urlencoded
method-type:put