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string[] scopes = new string[] {AnalyticsService.Scope.Analytics}; // view and manage your Google Analytics data

var keyFilePath = @"c:\file.p12" ;    // Downloaded from https://console.developers.google.com
var serviceAccountEmail = "xx@developer.gserviceaccount.com";  // found https://console.developers.google.com

//loading the Key file
var certificate = new X509Certificate2(keyFilePath, "notasecret", X509KeyStorageFlags.Exportable);
var credential = new ServiceAccountCredential( new ServiceAccountCredential.Initializer(serviceAccountEmail) {
                                                   Scopes = scopes}.FromCertificate(certificate));

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var service = new AnalyticsService(new BaseClientService.Initializer() { HttpClientInitializer = credential,
                                                                         ApplicationName = "Analytics API Sample",});

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 AnalyticsService services = new AnalyticsService(new BaseClientService.Initializer()
            {
                ApiKey = "[API key]",  // from https://console.developers.google.com (Public API access)
                ApplicationName = "Analytics API Sample",
            });

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var services = new DriveService(new BaseClientService.Initializer(){
                ApiKey = "[API key]",  // from https://console.developers.google.com (Public API access)
                ApplicationName = "Drive API Sample",
            });

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 string _client_id = "[From Google Developer Console]";
string _client_secret = "[From Google Developer Console]";


var credential = GoogleWebAuthorizationBroker.AuthorizeAsync(new ClientSecrets { ClientId = _client_id, ClientSecret = _client_secret },
                                                                                  new string[] {"email" },
                                                                                  Environment.UserName ,
                                                                                  CancellationToken.None,
                                                                                  new FileDataStore("Daimto.GooglePlus.Auth.Store")).Result;

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/// <summary>
        /// Authenticate to Google Using Oauth2
        /// Documentation https://developers.google.com/accounts/docs/OAuth2
        /// </summary>
        /// <param name="clientId">From Google Developer console https://console.developers.google.com</param>
        /// <param name="clientSecret">From Google Developer console https://console.developers.google.com</param>
        /// <param name="userName">A string used to identify a user.</param>
        /// <returns></returns>
        public static WebmastersService  AuthenticateOauth(string clientId, string clientSecret, string userName)
        {

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<?xml version="1.0" encoding="UTF-8"?>
<Wix
    xmlns="http://schemas.microsoft.com/wix/2006/wi">
    <Product Id="*" Name="Daimto for SSIS (SQL Server 2008)" Language="1033" Version="1.0.0.0" 
                    Manufacturer="DAIMTO" UpgradeCode="84543418-55c4-48c0-b5be-2496fb84ffb6">
        <Package InstallerVersion="200" Compressed="yes" InstallScope="perUser"  
                  InstallPrivileges="elevated" AdminImage="yes" />
        <MediaTemplate EmbedCab="yes" CompressionLevel="high" />
        <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />

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/// <summary>
/// Creates the auth url
/// https://accounts.google.com/o/oauth2/auth?client_id={clientid}&amp;redirect_uri=urn:ietf:wg:oauth:2.0:oob&amp;scope={scope}&amp;response_type=code
/// client id from google developer console.
/// scope comma seproated 
/// </summary>
/// <returns></returns>
public static Uri GetAuthURI()
{
  return new Uri(string.Format("https://accounts.google.com/o/oauth2/auth?client_id={0}&redirect_uri=urn:ietf:wg:oauth:2.0:oob&scope={1}&response_type=code", Properties.Resources.clientId, Properties.Resources.scope));

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private void auth()
        {

            webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(GetTitle);
            webBrowser1.Navigate(SimpleAuth.GetAuthURI().ToString());

        }


        /// <summary>

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   class AccessTokenResponse
    {
        public string access_token { get; set; }
        public string token_type { get; set; }
        public string expires_in { get; set; }
    }
  
  /// <summary>
        /// takes a refreshtoken and exchanges it for an accessotken.
        /// </summary>