intagration Linkedin API with Asp.net

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ASP.NET

I am struggling for integrate linked-in API with asp.net i getting the API key sec key authorization code but not getting the access token please tell me asap how i get the access token i try all the method passing the parameters i query string every time i getting the new authorize code and that code passing with query parameters

i am using this link for getting the authorization code is successfully getting the authorize code.

https://www.linkedin.com/uas/oauth2/authorization?response_type=code
                                           &client_id=YOUR_API_KEY
                                           &scope=SCOPE
                                           &state=STATE
                                           &redirect_uri=YOUR_REDIRECT_URI

but when i use this url for getting the access token error 400 bad request or invalid parameters.

https://www.linkedin.com/uas/oauth2/accessToken?grant_type=authorization_code
                                           &code=AUTHORIZATION_CODE
                                           &redirect_uri=YOUR_REDIRECT_URI
                                           &client_id=YOUR_API_KEY
                                           &client_secret=YOUR_SECRET_KEY

kin dally tell me asap because i am working on it and complete within few days.