OAuth 2.0 authentication in RestSharp -

i trying authenticate restful service (sabre rest api) using restsharp library not able authenticate it. using client id , secret. please tell me how authenticate using oauth 2.0 authenticator.

i have tried code. ( sabre using oauth 2.0 authentication )

public actionresult index() {     var client = new restclient("https://api.test.sabre.com");     client.authenticator = new httpbasicauthenticator("myclientid", "myclientsecret");      restrequest request = new restrequest("/v1/auth/token", method.post);     request.addheader("authorization", "basic " + client);     request.addheader("content-type", "application/x-www-form-urlencoded");     request.addparameter("grant_type", "client_credentials");      irestresponse response = client.execute(request);     var content = response.content;     viewbag.r = content;     return view(); } 

i got result

{"error":"invalid_client","error_description":"credentials missing or syntax not correct"} 

please tell doing wrong. thanks

snapshot of fiddler comparison of running code (not restsharp) , code using restsharp shown

with restsharp

seems me adding authorization header twice. documentation here says

the authenticator’s authenticate method first thing called upon calling restclient.execute

looking @ implementation of httpbasicauthenticator, authenticate method adds appropriate header request.

so remove following line example:

request.addheader("authorization", "basic " + client);