Google plus and facebook login using asp.net

I am working on asp.net application where i am using facebook and google plus login with c sharp code. Everything working fine for both social platforms. I am using the following code:

CS:

 GoogleProfile profile = new GoogleProfile();
FaceBookUser faceBookUser = new FaceBookUser();
protected void Page_Load(object sender, EventArgs e)
{
    try
    {
  //Google plus 
        GoogleCoect.ClientId = ConfigurationManager.AppSettings["GoogleClientId"].ToString();
        GoogleCoect.ClientSecret = ConfigurationManager.AppSettings["GoogleClientSecret"].ToString();


        //Facebook
        FaceBookCoect.API_Key = ConfigurationManager.AppSettings["FacebookAPIKey"].ToString();
        FaceBookCoect.API_Secret = ConfigurationManager.AppSettings["FacebookAPISecret"].ToString();
       if (!IsPostBack)
        {
     if (Session["checkValue"].ToString().Contains("Google"))
                {
                    if (!string.IsNullOrEmpty(Request.QueryString["code"]))
                    {
                        //GoogleProfile profile = new GoogleProfile();


                        string code = Request.QueryString["code"];
                        string json = GoogleCoect.Fetch("me", code);
                        profile = new JavaScriptSerializer().Deserialize<GoogleProfile>(json);

                    if (Request.QueryString["error"] == "access_denied")
                    {
                        //ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('Access denied.')", true);
                    }
                }
                else
                {
                    if (Request.QueryString["error"] == "access_denied")
                    {
                        //ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('User has denied access.')", true);
                        //retu;
                    }
                    // FaceBookUser faceBookUser = new FaceBookUser();
                    string code = Request.QueryString["code"];
                    if (!string.IsNullOrEmpty(code))
                    {
                        string data = FaceBookCoect.Fetch(code, "me");
                        faceBookUser = new JavaScriptSerializer().Deserialize<FaceBookUser>(data);

                        }
                        else
                        {
                            Login(GetDataFromService.GetFacebookUserName(hdnApiId.Value), "", hdnApiId.Value);

                        }
                    }
                }
            }
   }
   }
    catch (Exception ex)
    {
        base.LogError(ex, "Server Not Responding");
    }
}

Google and facebook signup button events:

 protected void btnGoogleSignUp_Click(object sender, EventArgs e)
    {

        Session["checkValue"] = "Google";
        GoogleCoect.RedirectUri = ConfigurationManager.AppSettings["RedirectSignUpUrl"].ToString();// Request.Url.AbsoluteUri.Split('?')[0];
        GoogleCoect.Authorize("profile", "email");

    }

    protected void btnFacebookSignUp_Click(object sender, EventArgs e)
    {

        Session["checkValue"] = "Facebook";
FaceBookCoect.Authorize("user_photos,email,user_location,
user_birthday", ConfigurationManager.AppSettings["RedirectSignUpUrl"].ToString());

}

Class:

 public class GoogleProfile
{
    public string Id { get; set; }
    public string DisplayName { get; set; }
    public Image Image { get; set; }
    public List<Email> Emails { get; set; }
    public string Gender { get; set; }
    public string ObjectType { get; set; }
    public name Name { get; set; }
}

public class Email
{
    public string Value { get; set; }
    public string Type { get; set; }
}

public class Image
{
    public string Url { get; set; }
}
public class name
{
    public string familyName { get; set; }
    public string givenName { get; set; }
}

public class FaceBookUser
{
    public string Id { get; set; }
    public string Name { get; set; }
    public string UserName { get; set; }
    public string PictureUrl { get; set; }
    public string Email { get; set; }
}

Problem:

Sometimes when i am going for facebook login after google login i am getting google api code instead of facebook api code. How i can resolve this issue may be this is coming due to caching. Thanks in advance. If you need more info i will try my best to explain in more detail.