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C# Facebook app / post on site

im very new with Facebook apps and read several threads for creating them, but I have some problems with it.
First of all what I want to do: I want to create a web application that is able to post pictures, text and links on a facebook page that is managed by me.
I used the Facebook C# SDK: here!
What I have:
string facebookPageId = "<my page id>";
string app_id = "<my app id>";
string app_secret = "<my app secret>";
string scope = "publish_stream,manage_pages";
var fb = new FacebookClient();
dynamic res = fb.Get("oauth/access_token", new
{
client_id = app_id,
client_secret = app_secret,
grant_type = "client_credentials"
});
var access_token = res.access_token;
dynamic messagePost = new ExpandoObject();
messagePost.access_token = access_token;
messagePost.link = "http://www.test.at";
messagePost.name = "Testbot";
messagePost.caption = "{*actor*} " + "hello this is a test";
messagePost.description = "[SOME_DESCRIPTION]";
FacebookClient app = new FacebookClient(access_token);
app.AppId = app_id;
app.AppSecret = app_secret;
try
{
var result = app.Post("/hrechttest" + "/feed", messagePost);
}
catch (Exception e)
{
}
Well the code runs without any exceptions but in the output window I get the following:
Exception thrown: 'Facebook.FacebookOAuthException' in Facebook.dll
The next problem is:
As I understood it you must link your facebook app with your facebook page, but when I want to do that I cant select the page:
So what I did wrong or missed?

publish_stream is deprecated since many years, publish_pages is the correct permission to post to a Page (as Page).
API reference: https://developers.facebook.com/docs/graph-api/reference/page/feed#publish
Make sure you are using a Page Token, not a User Token:
https://developers.facebook.com/docs/facebook-login/access-tokens
http://www.devils-heaven.com/facebook-access-tokens/
How to create Page Apps is explained in the docs too: https://developers.facebook.com/docs/pages/tabs

using the exmple of google drive sdk for read spreadsheet

I am trying to use the google drive sdk exmple for read spread sheet.
when I am opening the example I am getting this error: "unhandled excption has occured......... returned unexpected result"404"
I am doing the following things:
1) in the login section I am entering my user name and password correctly (validate it a couple of times that it is correct)
2) go to tab :"Selected SpreadSheet". then the error comes up

The problem you are experiencing is similar to this question: Google drive API to C#
You can no longer log into Google Spreadsheets with the old user credentials (username/password only). You need to use OAuth 2.0 now (which requires you to create an app and credentials at console.developers.google.com).
You can use the example below for the authentication logic, and use the logic in the logic found in this question to actually manipulate the file:
Accessing Google Spreadsheets with C# using Google Data API
Here is my answer to the linked question in case it gets deleted in the future:
This example requires you to use the following nuget packages and their dependencies:
Google.GData.Spreadsheets
Also, you must go to https://console.developers.google.com and register your application and create credentials for it so you can enter your CLIENT_ID and CLIENT_SECRET.
This is the documentation I used to put together this example: https://developers.google.com/google-apps/spreadsheets/
using System;
using System.Windows.Forms;
using Google.GData.Client;
using Google.GData.Spreadsheets;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
string CLIENT_ID = "YOUR_CLIENT_ID";
string CLIENT_SECRET = "YOUR_CLIENT_SECRET";
string SCOPE = "https://spreadsheets.google.com/feeds https://docs.google.com/feeds";
string REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob";
OAuth2Parameters parameters = new OAuth2Parameters();
parameters.ClientId = CLIENT_ID;
parameters.ClientSecret = CLIENT_SECRET;
parameters.RedirectUri = REDIRECT_URI;
parameters.Scope = SCOPE;
string authorizationUrl = OAuthUtil.CreateOAuth2AuthorizationUrl(parameters);
MessageBox.Show(authorizationUrl);
Console.WriteLine("Please visit the URL in the message box to authorize your OAuth "
+ "request token. Once that is complete, type in your access code to "
+ "continue...");
parameters.AccessCode = Console.ReadLine();
OAuthUtil.GetAccessToken(parameters);
string accessToken = parameters.AccessToken;
Console.WriteLine("OAuth Access Token: " + accessToken);
GOAuth2RequestFactory requestFactory =
new GOAuth2RequestFactory(null, "MySpreadsheetIntegration-v1", parameters);
SpreadsheetsService service = new SpreadsheetsService("MySpreadsheetIntegration-v1");
service.RequestFactory = requestFactory;
SpreadsheetQuery query = new SpreadsheetQuery();
SpreadsheetFeed feed = service.Query(query);
// Iterate through all of the spreadsheets returned
foreach (SpreadsheetEntry entry in feed.Entries)
{
// Print the title of this spreadsheet to the screen
Console.WriteLine(entry.Title.Text);
}
Console.ReadLine();
}
}
}

Post message with Facebook SDK .NET

I have created a facebook page and a facebook application for my website and now I need to post messages onto the facebook page with help of facebook SDK .NET.
This is what I got so far :
public static bool UploadPost(string message)
{
dynamic result;
//https://developers.facebook.com/tools/explorer/
//https://developers.facebook.com/tools/access_token/
FacebookClient client = new FacebookClient("secret access token");
result = client.Get("oauth/access_token", new
{
client_id = "[Client ID number]",
client_secret = "[Client sercret",
grant_type = "client_credentials",
});
result = client.Post("[facebook app Id]/feed", new { message = "Test Message from app" });
//result.id;
result = client.Get("[facebook app Id]");
return false;
}
When running this I get : Additional information: (OAuthException - #200) (#200) The user hasn't authorized the application to perform this action on client.Post. If I remove the client.Post row every thing works good, the correct data is fetched.
I have tried follow some helps on facebook SDK .NET website but it is still not working.
The main problem now is that I get permission exception. I was hoping that my facebook app hade enouth permissions to publish post from my website to the facebook page.

Here is a step wise tutorial to register your application with facebook and get an app Id for your application.
Then for permissions ::
private const string ExtendedPermissions = "user_about_me,read_stream,publish_stream";
This is a string of permissions. Pass it on further for getting correct permissions to post messages on page. Post using your standard code for posting no FB pages.
Cheers. Hope it helps.

Are you trying to post to [facebook app id]?
I would recomend to post to "me/feed" and test if that works.
Also, to post to Facebook you have to have the publish_stream permission
private async Task Authenticate()
{
string message = String.Empty;
try
{
session = await App.FacebookSessionClient.LoginAsync("user_about_me,read_stream,publish_actions");
App.AccessToken = session.AccessToken;
App.FacebookId = session.FacebookId;
Dispatcher.BeginInvoke(() => NavigationService.Navigate(new Uri("/Pages/LandingPage.xaml", UriKind.Relative)));
}
catch (InvalidOperationException e)
{
message = "Login failed! Exception details: " + e.Message;
MessageBox.Show(message);
}
}
Should work :)

The following should work.
var fb = new FacebookClient("access_token");
fb.PostCompleted += (o, e) => {
if(e.Error == null) {
var result = (IDictionary<string, object>)e.GetResultData();
var newPostId = (string)result.id;
}
};
var parameters = new Dictionary<string, object>();
parameters["message"] = "My first wall post using Facebook SDK for .NET";
fb.PostAsync("me/feed", parameters);
This was taken directly from the documentation.

By creating a extended page token and use it to make the post everything works just fine. See this : How to get Page Access Token by code?
Im surprised that this simple task was so hard to get running and that there was vary little help to get.

Facebook C# SDK trouble getting me/accounts

I'm trying to write a windows service that will post to my Facebook Page with results when it runs.
I just downloaded Facebook C# SDK v6.0.10.0 and writing the windows application in .Net 4.0
I created a facebook application account and got the AppID and Secret code needed.
The end goal would be to have this windows service post on my facebook page wall as the page and not the application user.
I keep getting an error when I go to get the accounts for my facebook application.
string strAppID = "my app api id";
string strSecret = "my app secret code";
Facebook.FacebookClient fbClient = new Facebook.FacebookClient();
fbClient.AppId = strAppID;
fbClient.AppSecret = strSecret;
dynamic ac = fbClient.Get("oauth/access_token", new
{
client_id = strAppID,
client_secret = strSecret,
grant_type = "client_credentials"
});
string strAccessToken = String.Empty;
strAccessToken = ac.access_token;
if (!String.IsNullOrEmpty(strAccessToken))
{
fbClient = new Facebook.FacebookClient(strAccessToken);
fbClient.AccessToken = strAccessToken;
fbClient.AppId = strAppID;
fbClient.AppSecret = strSecret;
//Here is where it is bombing
dynamic fbAccounts = fbClient.Get("/me/accounts");
fbClient = new Facebook.FacebookClient(strAccessToken);
fbClient.AccessToken = strAccessToken;
fbClient.AppId = strAppID;
fbClient.AppSecret = strSecret;
dynamic me = fbClient.Get("**Name of the facebook page I am trying to post to**");
string strPageID = String.Empty;
strPageID = me.id;
string strPageAccessToken = String.Empty;
//Loop over the accounts looking for the ID that matches your destination ID (Fan Page ID)
foreach (dynamic account in fbAccounts.data)
{
if (account.id == strPageID)
{
//When you find it, grab the associated access token and put it in the Dictionary to pass in the FB Post, then break out.
strPageAccessToken = account.access_token;
break;
}
}
try
{
fbClient.AccessToken = strPageAccessToken;
var args = new Dictionary<string, object>();
args["message"] = "Testing 123";
fbClient.Post("/" + strPageID + "/feed", args);
}
catch (Facebook.FacebookOAuthException ex)
{
// oauth exception occurred
}
catch (Facebook.FacebookApiLimitException ex)
{
// api limit exception occurred.
}
catch (Facebook.FacebookApiException ex)
{
// other general facebook api exception
}
catch (Exception ex)
{
// non-facebook exception such as no internet connection.
}
}
The error I am getting is on the line:
dynamic fbAccounts = fbClient.Get("/me/accounts");
(OAuthException - #2500) An active access token must be used to query information about the current user.

see here: (OAuthException - #2500) An active access token must be used to query information about the current user
you are getting access token for the APPLICATION, not for a user.
Therefore, "me" does not make sense. You should supply ID there -
either your user ID, or your app ID, or any other ID your app has
permissions for.

dynamic ac = fbClient.Get("oauth/access_token", new
{
client_id = strAppID,
client_secret = strSecret,
grant_type = "client_credentials"
});
The above code may not work for version 6.0.
OAuth 2.0 - exchange code for access token
FacebookClient supports parsing only json responses. Due to this
reason “oauth/access_token” token will not work when using
FacebookClient.Get(“oauth/access_token”). Instead you will need to use
a method in FacebookOAuthClient.
You can find more details here: http://blog.prabir.me/post/Facebook-CSharp-SDK-Making-Requests.aspx
Hope this helps.

Problem retrieving an access token with code returned

I am having a problem retrieving the user's access token after he/she has authorized my Facebook application to access their information and post for them, etc... Facebook returns a code query string to my website, so I can receive the access token for the user. I use the following code to get the access code.
string AppKey = "[REMOVED]";
string AppSecret = "[REMOVED]";
var oAuth = new Facebook.FacebookOAuthClient();
oAuth.AppId = AppKey;
oAuth.AppSecret = AppSecret;
oAuth.RedirectUri = new Uri("http://www.mywebsite.com");
Label3.Text = Request.QueryString["code"];
try
{
var accessToken = oAuth.ExchangeCodeForAccessToken(Request.QueryString["code"]);
string accessTokenString = accessToken.ToString();
HttpCookie aCookie = new HttpCookie("MyWebsite_FBAccessToken");
aCookie.Value = accessTokenString;
Response.Cookies.Add(aCookie);
Response.Redirect("~/Process/ProcessToken.aspx");
}
catch (Facebook.FacebookOAuthException error)
{
Label2.Text = error.Message;
}
My code gets held up here:
var accessToken = oAuth.ExchangeCodeForAccessToken(Request.QueryString["code"]);
And I receive the following error.
(OAuthException) Error validating verification code.
Does this seem like there is a problem with my code, or does it look like there may be a setting problem with my Facebook application? I know my App ID and Secret are correct.