Here is my partial view called _Facebook.cshtml

@using Skybrud.Social.Facebook
@using Skybrud.Social.Facebook.OAuth
@inherits WebViewPage

@{

    // Initialize a new instance of the OAuth client
    FacebookOAuthClient oauth = new FacebookOAuthClient
    {
        AppId = "205808210016635",
        AppSecret = "22076d2329e422cb2e6475a01e40679a",
        RedirectUri = "https://localhost:44304/"
    };

    // Read some input from the query string
    string code = Request.QueryString["code"];
    string action = Request.QueryString["do"];
    string error = Request.QueryString["error"];
    string errorCode = Request.QueryString["error_code"];
    string errorDescription = Request.QueryString["error_description"];


    // Handle the state when the user clicks our login button
    if (action == "login")
    {

        // Get the redirect URI (if present)
        string redirect = (Request.QueryString["redirect"] ?? "/");

        // Set the state (a unique/random value)
        string state = Guid.NewGuid().ToString();
        Session["Facebook_" + state] = redirect;

        // Construct the authorization URL
        string authorizatioUrl = oauth.GetAuthorizationUrl(state, FacebookScope.Email);

        // Redirect the user to the OAuth dialog
        Response.Redirect(authorizatioUrl);
        return;

    }

    // Handle if an error occurs during the Facebook authentication (eg. if the user cancels the login)
    if (!String.IsNullOrWhiteSpace(error))
    {
        <div class="alert alert-danger">
            <strong>Login failed</strong><br />
            @errorDescription (code: @errorCode)
        </div>
        return;
    }

    // Handle the state when the user is redirected back to our page after a successful login with the Facebook API
    if (!String.IsNullOrWhiteSpace(code))
    {

        // Get the state from the query string
        string state = Request.QueryString["state"];

        // Validate state - Step 1
        if (state == null)
        {
            <div class="alert alert-danger">No <strong>state</strong> specified in the query string.</div>
            return;
        }

        // Validate state - Step 2
        string session = Session["Facebook_" + state] as string;
        if (session == null)
        {
            <div class="alert alert-danger">Session expired?</div>
            return;
        }

        // Remove the state from the session
        Session.Remove("facebook_" + state);

        // Exchange the auth code for an access token
        string accessToken = oauth.GetAccessTokenFromAuthCode(code);

        // Print out the access token to the user (we really shouldn't do this in a live environment)
        <div class="alert alert-info">
            <strong>Access token:</strong> @accessToken
        </div>

        // Initialize a new instance of the FacebookService class so we can make calls to the API
        FacebookService service = FacebookService.CreateFromAccessToken(accessToken);

        var response = service.Users.GetUser("me");

        <div class="alert alert-info">
            <strong>ID:</strong> @response.Body.Id<br />
            <strong>Name:</strong> @response.Body.Name<br />
            <strong>Email:</strong> @response.Body.Email
        </div>

        return;

    }

    <a href="?do=login" class="btn btn-primary">Login with Facebook</a>

}

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