Face Book Login Connect and Save User information into database

Step 1
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First  Create  Your  App  ID  on Following  Link

http://developers.facebook.com/setup/

  Site Name: Test Website
  Site URL:  http://localhost:8353/LSATWebsite/( for  Local Test  set  your  own local host  like  this  is  mine)
 
Site URL:  www.mywebsite.com (for  live Test)

   click  on  create app
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Step 2
//  copy  this  code before  Head tag



Step 3

//  Set  this  login  div  where  you  want  set  your  facebook  login button


   

                                            data-off="OFF" perms="email">
                   
                   

                   

                   
                   
                   
                   

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Step 4
Index  Page  Code

page  load()
{
FacebookLogin();
}

#region FacebookLogin

    private void FacebookLogin()
    {
        if (Request.QueryString["loginby"] != null)
        {
            if (Convert.ToString(Request.QueryString["loginby"]) == "fb")
            {
                String AppID = "fbs_247350651959904";

                if (Request.Cookies[AppID] != null)
                {
                    try
                    {
                        Session["UserID"] = null;
                        string token = Request.Cookies[AppID].Values[0].ToString();
                        string userid = Request.Cookies[AppID].Values[5].ToString();
                        int charCount = (userid.Length - 1);
                        string finalUser = userid.Substring(0, charCount);
                        string fbUser = "https://graph.facebook.com/" + finalUser + "?access_token=" + token;
                        //Parse the JSON that is returned:
                        JObject u = JObject.Parse(Convert.ToString(requestFBData(fbUser)));
                        string userName = "";
                        if (u["link"].ToString().Contains("profile.php?id="))
                            userName = u["link"].ToString().Replace("http://www.facebook.com/profile.php?id=", "").Replace("\"", "");
                        else
                            userName = u["link"].ToString().Replace("http://www.facebook.com/", "").Replace("\"", "");

                        // Now get their email address and first name (we will need it later).
                        UserClass objUser = new UserClass();

                        //objUser.Email   = u["email"].ToString().Replace("\"", "");
                        //  objUser.password  = Membership.GeneratePassword(10, 6);
                        objUser.FacebookToken = token;
                        objUser.FaceBookId = userName;
                        objUser.Name = u["first_name"].ToString().Replace("\"", "");
                        //objUser.lstname  = u["last_name"].ToString().Replace("\"", "");
                        objUser.OutputMessage = "http://graph.facebook.com/" + finalUser + "/picture";
                        //string userFacebook = u["link"].ToString().Replace("\"", "");
                        Session["UserID"] = objUser.LoginByFacebookToken();
                        if (Session["UserID"] != null && Session["UserID"] != "")
                        {
                            objUser.UserID = Convert.ToInt32(Session["UserID"]);
                            Session["FirstName"] = "Hi, " + objUser.Get_Username() + " Good Luck With Your Lsat.";
                            Session["FbLogin"] = "True";
                        }
                        FormsAuthentication.SetAuthCookie(userName, true);
                        Response.Redirect("index.aspx", true);
                    }
                    catch { Exception e; }
                }

            }
        }
    }

    object requestFBData(string action)
    {
        WebRequest req = HttpWebRequest.Create(action);
        WebResponse resp = req.GetResponse();
        StreamReader sr = new StreamReader(resp.GetResponseStream());
        string results = sr.ReadToEnd();
        sr.Close();
        return results;
    }
    #endregion

//  i  am  using  user  class  to  save  data  on  my  databse

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Step 6
Log  Out Page  Code

page  load  ()
{
 LogOut();
}

 private void LogOut()
    {
        if (Request.QueryString["logout"] != null)
        {
            if (Convert.ToString(Request.QueryString["logout"]) == "fb")
            {
                String AppID = "fbs_247350651959904";

                 if (Request.Cookies[AppID] == null)
                 {
                     Session.Abandon();

                     Response.Redirect("index.aspx");
                 }
                 
            }
        }
    }