To push some tasks to Google Tasks

Question

I m working on Google Tasks after coding I find that its work on VS 2012 not on VS 2010.

I pasted my code below 

using System;

using System.Reflection;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Threading;

using System.Web;

using System.Web.UI.WebControls;

using Google.Apis.Auth.OAuth2;

using Google.Apis.Auth.OAuth2.Flows;

using Google.Apis.Auth.OAuth2.Web;

using Google.Apis.Services;

using Google.Apis.Tasks.v1;

using Google.Apis.Tasks.v1.Data;

using Google.Apis.Util.Store;

public partial class Default2 : System.Web.UI.Page

{

    private TasksService service;

        // Application logic should manage users authentication. This sample works with only one user. You can change

        // it by retrieving data from the session.

        private const string UserId = "user-id";

        protected void Page_Load(object sender, EventArgs e)

        {

            GoogleAuthorizationCodeFlow flow;

            

            flow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer

           {

               DataStore = new SessionDataStore(Session),

               ClientSecrets = new ClientSecrets() { ClientId = "381102426727-ltgvsud3pkpdqet43hs59p6n1nseaioo.apps.googleusercontent.com", ClientSecret = "BhUVW4QG-ZMVIAelClKIg4dj" },

               Scopes = new[] { TasksService.Scope.TasksReadonly, TasksService.Scope.Tasks }

           });

            //var uri = Request.Url.ToString();

            var uri = "http://localhost:55149/GoogleTaskSample/Default2.aspx";

            var code = Request["code"];

            if (code != null)

            {

                var token = flow.ExchangeCodeForTokenAsync(UserId, code, uri, CancellationToken.None).Result;

                // Extract the right state.

                var oauthState = AuthWebUtility.ExtracRedirectFromState(flow.DataStore, UserId, Request["state"]).Result;

                Response.Redirect(oauthState);

            }

            else

            {

                var result = new AuthorizationCodeWebApp(flow, uri, uri).AuthorizeAsync(UserId, CancellationToken.None).Result;

                if (result.RedirectUri != null)

                {

                    // Redirect the user to the authorization server.

                    Response.Redirect(result.RedirectUri);

                }

                else

                {

                    // The data store contains the user credential, so the user has been already authenticated.

                    service = new TasksService(new BaseClientService.Initializer

                    {

                        ApplicationName = "TempApp",

                        HttpClientInitializer = result.Credential

                    });

                    service.Tasks.Insert(new Task() { Title = "Vikas" }, "@default").Execute();

                }

            }

        }

        /// <summary>Gets the TasksLists of the user.</summary>

        public async System.Threading.Tasks.Task FetchTaskslists()

        {

            try

            {

                // Execute all TasksLists of the user asynchronously.

                TaskLists response = await service.Tasklists.List().ExecuteAsync();

                ShowTaskslists(response);

            }

            catch (Exception ex)

            {

                var str = ex.ToString();

                str = str.Replace(Environment.NewLine, Environment.NewLine + "<br/>");

                str = str.Replace("  ", " &nbsp;");

                output.Text = string.Format("<font color=\"red\">{0}</font>", str);

            }

        }

        private void ShowTaskslists(TaskLists response)

        {

            if (response.Items == null)

            {

                output.Text += "You have no task lists!<br/>";

                return;

            }

            output.Text += "Showing task lists...<br/>";

            foreach (TaskList list in response.Items)

            {

                Panel listPanel = new Panel() { BorderWidth = Unit.Pixel(1), BorderColor = Color.Black };

                listPanel.Controls.Add(new Label { Text = list.Title });

                listPanel.Controls.Add(new Label { Text = "<hr/>" });

                listPanel.Controls.Add(new Label { Text = GetTasks(list) });

                lists.Controls.Add(listPanel);

            }

        }

        private string GetTasks(TaskList taskList)

        {

            var tasks = service.Tasks.List(taskList.Id).Execute();

            if (tasks.Items == null)

            {

                return "<i>No items</i>";

            }

            var query = from t in tasks.Items select t.Title;

            return query.Select((str) => "&bull; " + str).Aggregate((a, b) => a + "<br/>" + b);

        }

        protected async void listButton_Click(object sender, EventArgs e)

        {

            await FetchTaskslists();

        }

        protected void ButtonClearDataStore_Click(object sender, EventArgs e)

        {

            var x = new SessionDataStore(Session);

            x.ClearAsync();

        }

}