c# - LinkedIn send a message -

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i want send message linkedin user connections. try following code:

            string s = @"<?xml version='1.0' encoding='utf-8'?> <mailbox-item>   <recipients>     <recipient>       <person path='/people/1234567' />     </recipient>   </recipients>   <subject>congratulations on test.</subject>   <body>test here</body> </mailbox-item>";              string url = "https://api.linkedin.com/v1/people/~/mailbox?oauth2_access_token=xxxxxxxxxxxx";              httpwebrequest webrequest = webrequest.create(url) httpwebrequest;             webrequest.timeout = 10000;             webrequest.contenttype = "text/xml";             webrequest.method = "post";             using (var writer = new streamwriter(webrequest.getrequeststream()))             {                 writer.write(s);             }              webresponse response = webrequest.getresponse();

i exception "the remote server returned error: (400) bad request." on last string. incorrectly?


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