LinkedInController.cs

public class LinkedInController : Controller
{
  public RedirectResult Profile()
  {
      var redirectUrl = "http://mydomain/linkedin/profilereturn/";
      var url = GetAuthorizationUrl(redirectUrl);
     return Redirect(url.ToString());
  }

  public ActionResult ProfileReturn(string code, string state)
  {
      var redirectUrl = "http://mydomain/linkedin/profilereturn/";
      var profile = ReadMyProfile(code, redirectUrl);

      var jsonProfile = Newtonsoft.Json.JsonConvert.SerializeObject(profile);
      return Content(jsonProfile);
  }

  private static Uri GetAuthorizationUrl(string redirectUrl)
  {
      var api = CreateAPI();

      var scope = Sparkle.LinkedInNET.OAuth2.AuthorizationScope.ReadBasicProfile |
                  Sparkle.LinkedInNET.OAuth2.AuthorizationScope.ReadEmailAddress |
                  Sparkle.LinkedInNET.OAuth2.AuthorizationScope.ReadContactInfo;

      var state = Guid.NewGuid().ToString();
      
      var url = api.OAuth2.GetAuthorizationUrl(scope, state, redirectUrl);
      return url;
  }

  private static Person ReadMyProfile(string code, string redirectUrl)
  {
      var api = CreateAPI();

      var userToken = api.OAuth2.GetAccessToken(code, redirectUrl);

      var user = new Sparkle.LinkedInNET.UserAuthorization(userToken.AccessToken);

      var fieldSelector = FieldSelector.For<Person>().WithFirstName()
                                                      .WithLastName()
                                                      .WithEmailAddress();

      var profile = api.Profiles.GetMyProfile(user, null, fieldSelector);

      return profile;
  }

    private static LinkedInApi CreateAPI()
    {
        var config = new LinkedInApiConfiguration(ConfigurationManager.AppSettings["LinkedIn_AppID"],
                                                  ConfigurationManager.AppSettings["LinkedIn_AppSecret"]);
        var api = new LinkedInApi(config);
        return api;
    }        
}