Facebook login example

fblogin.cshtml

@if(Request.IsAuthenticated) {
    
    <text><img src="http://graph.facebook.com/@User.Identity.Name/picture" alt=""/> <strong>@User.Identity.Name</strong>!
    
    [ @Html.ActionLink("Log Off", "LogOff", "Account") ]</text>
}
else
{
    
    <text>Login using Facebook:@User.Identity.Name  </text> 
    <fb:login-button scope="email,user_checkins" onlogin="afterFacebookConnect();" 
       autologoutlink="false" ></fb:login-button>
    <div id="fb-root" style="display:inline; margin-left:20px;"></div>
    <text>OR </text>
    @:[ @Html.ActionLink("Log On", "LogOn", "Account") ]
}
<script language="javascript" type="text/javascript">
    window.fbAsyncInit = function () {
        FB.init({ appId: 144248845702538,
            status: true, cookie: false, xfbml: true
        });
    };
    function afterFacebookConnect() {        
        FB.getLoginStatus(function (response) {
            
            if (response.authResponse) {
                console.log("Calling controller");
                window.location = "../Account/FacebookLogin?token=" +
                       response.authResponse.accessToken;
            } else {
                // user clicked Cancel
                console.log("response.session did not come true");
            }
        });
    };
    $(document).ready(function () {
        if (document.getElementById('fb-root') != undefined) {
            var e = document.createElement('script');
            e.type = 'text/javascript';
            e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
            e.async = true;
            document.getElementById('fb-root').appendChild(e);
        }
    });
</script>



@if(Request.IsAuthenticated) {
    <text>Welcome <strong>@User.Identity.Name</strong>!
    [ @Html.ActionLink("Log Off", "LogOff", "Account") ]</text>
}
else {
    @:[ @Html.ActionLink("Log On", "LogOn", "Account") ]
}

    public ActionResult FacebookLogin(string token)
    {
        System.Diagnostics.Debug.WriteLine(token);
        WebClient client = new WebClient();
        string JsonResult = client
            .DownloadString(string.Concat("https://graph.facebook.com/me?access_token=", token));
        JObject jsonUserInfo = JObject.Parse(JsonResult);
        string username = jsonUserInfo.Value<string>("username");
        string locale = jsonUserInfo.Value<string>("locale");
        string email = jsonUserInfo.Value<string>("email");
        string picture = jsonUserInfo.Value<string>("picture");
        int facebook_userID = jsonUserInfo.Value<int>("id");

        FormsAuthentication.SetAuthCookie(username, true);

        return RedirectToAction("Index", "Home");

    }