Facebook Login, impossible to obtain a Popup

I searched a lot on SOF but didn't find an answer to my problem, so I create a new thread.
I'm working on a Facebook Application, and want ton test if the user is connected, or not.
If he's not, I want to have the facebook Popup for the login, but it's impossible for me to obtain what I want.

Here is the code :

I tried a lot of things :

String AppID = System.Configuration.ConfigurationManager.AppSettings["FB_appId"];
 String redirect_uri = Controller.GetCurrentPageFacebookPublishedPath(this.Request);
 Response.Redirect("https://www.facebook.com/login.php?client_id=" + AppID + 
 "&redirect_uri=" + redirect_uri + "&display=popup");
 

Or this :

FacebookClient client = new FacebookClient();
 Dictionary<string, object> PostParameters = new Dictionary<string, object>();
 PostParameters.Add("client_id", AppID);
 PostParameters.Add("display", "popup");
 PostParameters.Add("redirect_uri", redirect_uri);
 //object res = client.Post("https://www.facebook.com/dialog/oauth", PostParameters);
 object res = client.Get("https://www.facebook.com/login.php", PostParameters);
 

But nothing works...

Is there something i do wrong? Should I do this in javascript ?

EDIT :

I finally didn't find a solution in c#, so I used javascript like that :

FB.getLoginStatus(function (response) {
             if (response.status === 'connected') {
                 var uid = response.authResponse.userID;
                 var accessToken = response.authResponse.accessToken;
             } else if (response.status === 'not_authorized') {
             } else {
                 $(".myBouton").click(function () {
                     FB.login(function (response) {
                     if (response.authResponse) {
                     console.log('Welcome!  Fetching your information.... ');
                     FB.api('/me', function (response) {
                     console.log('Good to see you, ' + response.name + '.');
                     });
                     } else {
                     console.log('User cancelled login or did not fully authorize.');
                     }
                     });
                 });
             }
         });
 

But I don't know how to call a function after that, because I have a lot of different buttons, and I want my actions being done, after the User log and redirection of course.

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