gmail login integration in asp.net using C#

Gmail login integration in asp.net application

source code(default.aspx)

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"

    CodeBehind="Default.aspx.cs" Inherits="google_login._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">

<style type="text/css">

.btngoogle

{

    background-image:url(images/google+login+button.png);

    border:1px solid white;

    cursor:pointer;

    }

</style>

<script type="text/javascript">

    function showimage() {

        var i = document.getElementById("imggoogle");

        i.src = "images/google+logout+button.png";

        i.style.border = "1px solid white";

    }

</script>

</asp:Content>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

    <div id="loginform">

        <div id="NotLoggedIn" runat="server">

            <table cellpadding="0" cellspacing="0">

                <tr>

                    <td>

                        <asp:Button ID="btnLoginToGoogle" runat="server" OnCommand="OpenLogin_Click"

                            ToolTip="Google_Login" CssClass="btngoogle"

                            CommandArgument="https://www.google.com/accounts/o8/id" Height="34px"

                            Width="143px" />

                    </td>

                </tr>

            </table>

            <p />

            <asp:Label runat="server" ID="lblAlertMsg" />

        </div>

    </div>

    <asp:Label ID="lblname" runat="server"></asp:Label>

    <asp:Label ID="lblemail" runat="server"></asp:Label>

    <asp:Label ID="lblbirthdate" runat="server"></asp:Label>

    <asp:Label ID="lblphone" runat="server"></asp:Label>

    <asp:Label ID="lblgender" runat="server"></asp:Label>

    <a id="btngmaillogout" runat="server" onserverclick="btngmaillogout_click">  

        <img src="http://accounts.google.com/logout" id="imggoogle" title="Google_LogOut" onerror="javascript:return showimage();" />

    </a>

</asp:Content>

ccodebehind page(default.aspx.cs)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using DotNetOpenAuth.OpenId;

using DotNetOpenAuth.OpenId.RelyingParty;

using DotNetOpenAuth.OpenId.Extensions.SimpleRegistration;

using DotNetOpenAuth.OpenId.Extensions.AttributeExchange;

using System.Web.Security;

using System.Net;

using System.IO;

namespace google_login

{

    public partial class _Default : System.Web.UI.Page

    {

        OpenIdRelyingParty openid = new OpenIdRelyingParty();

       

        protected void Page_Load(object sender, EventArgs e)

        {

           

                HandleOpenIDProviderResponse();

                      

        }

        protected void HandleOpenIDProviderResponse()

        {          

                var response = openid.GetResponse();

              

                    if (response != null)

                    {

                        switch (response.Status)

                        {

                            case AuthenticationStatus.Authenticated:

                                NotLoggedIn.Visible = false;

                                btngmaillogout.Visible = true;

                                var fetchResponse = response.GetExtension<FetchResponse>();

                                Session["FetchResponse"] = fetchResponse;

                                var response2 = Session["FetchResponse"] as FetchResponse;

                                lblemail.Text = response2.GetAttributeValue(WellKnownAttributes.Contact.Email);

                                lblname.Text = GetFullname(response2.GetAttributeValue(WellKnownAttributes.Name.First),response2.GetAttributeValue(WellKnownAttributes.Name.Last));

                                lblbirthdate.Text = response2.GetAttributeValue(WellKnownAttributes.BirthDate.WholeBirthDate);

                                lblphone.Text = response2.GetAttributeValue(WellKnownAttributes.Contact.Phone.Mobile);

                                lblgender.Text = response2.GetAttributeValue(WellKnownAttributes.Person.Gender);

                                break;

                            case AuthenticationStatus.Canceled:

                                lblAlertMsg.Text = "Cancelled.";

                                break;

                            case AuthenticationStatus.Failed:

                                lblAlertMsg.Text = "Login Failed.";

                                break;

                        }

                    }

                    else

                    {

                        return;

                    }

        }

        protected void OpenLogin_Click(object src, CommandEventArgs e)

        {

            string discoveryUri = e.CommandArgument.ToString();

            var b = new UriBuilder(Request.Url) { Query = "" };

            var req = openid.CreateRequest(discoveryUri, b.Uri, b.Uri);

           

            var fetchRequest = new FetchRequest();

            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Contact.Email);

            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Name.First);

            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Name.Last);

            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Person.Gender);

            fetchRequest.Attributes.AddRequired(WellKnownAttributes.Contact.Phone.Mobile);

            fetchRequest.Attributes.AddRequired(WellKnownAttributes.BirthDate.WholeBirthDate);

            req.AddExtension(fetchRequest);

            req.RedirectToProvider();

        }

        private static string GetFullname(string first, string last)

        {

            var _first = first ?? "";

            var _last = last ?? "";

            if (string.IsNullOrEmpty(_first) || string.IsNullOrEmpty(_last))

                return "";

            return _first + " " + _last;

        }

        protected void btngmaillogout_click(object sender, EventArgs e)

        {

            lblemail.Text = "";

            lblname.Text = "";

            btngmaillogout.Visible = false;           

            Response.Redirect("~/Default.aspx");        

        }

    }

}

Download Source Code:gmail.login