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How to also include my app's name while sharing content?

user can share a link from inside my app:
ShareLinkTask linkTask = new ShareLinkTask();
linkTask.Title = "I like it";
linkTask.Message = "I love this movie";
linkTask.LinkUri = new Uri(link, UriKind.Absolute);
linkTask.Show();
problem: I want to include my app's name too something like this sent by my awesome app!. If I append this to Message user can remove it. How can I add my app name without user be able to remove it? thanks.

This is not possible with the built in share tasks, probably to protect the user from an app posting text without permission. To get this functionality you will have to implement it by working directly with the Facebook, Twitter, etc. APIs.

how to post on facebook wall for specific list of users using asp.net c#?

I am trying to post on specific group of users on facebook such as (close friends, or family, or college friend...) and I used the code bellow.
code that I used:
1
FacebookClient fpost1 = new FacebookClient(access_token);
fpost1.Post("/1234567890/feed", new { message = "test post"});
note: access_token is working correctly when I am doing some job before this exception.
I put my friendlist id instead of 1234567890, that you can get it from graph .../me?fields=friendlists
it did not work and gave me this error "(OAuthException - #2) An unexpected error has occurred. Please retry your request later."
2
FacebookClient fpost1 = new FacebookClient(access_token);
fpost1.Post("/me/feed", new { message = "it is very cold.", to="1234567890"});
this one work, but it post to "only me" as target.
thank you

It looks to me that what you are doing here...
FacebookClient fpost1 = new FacebookClient(access_token);
fpost1.Post("/1234567890/feed", new { message = "test post"});
is wrong. Because I believe that 1234567890 is a user-id, right? Not a friendslist-id. According to the documentation this edge/endpoint signature goes like....
/{user-id}/feed
where user-id is obviously a user id. The documentation states that...
Most nodes in the Graph API have edges that can be published to (such as Photos or Posts). All Graph API publishing is done simply with an HTTP POST request to the relevant endpoint with any necesssary parameters included. For example, if you wanted to publish a post on behalf of someone, you would make an HTTP POST request as below:
POST graph.facebook.com
/{user-id}/feed?
message={message}&
access_token={access-token}
Notice that it says "On Behalf of Someone". My understanding is that you are publishing on behalf of someone and to do that, this someone must have requested an access_token through your application. In other words, if this user hasn't logged in to your app and generated a valid access token you cannot publish on his/her wall

POST graph.facebook.com
me/feed?message="hello"&privacy={"value": "CUSTOM", "allow": "1234567890"}
where the 1234567890 is one of friendlists id

How do I get Google Calendar feed from user's access token?

Using OAuth I do get access token from Google. The sample that comes with Google and even this one:
http://code.google.com/p/google-api-dotnet-client/source/browse/Tasks.SimpleOAuth2/Program.cs?repo=samples
show how to use Tasks API. However, I want to use Calendar API. I want to get access to user's calendar. Can anybody tell me how do I do that?

Take a look at the samples:
Getting Started with the .NET Client Library
On the right side of the page linked above there is a screen shot showing the sample projects contained in the Google Data API solution. They proofed to be very helpful (I used them to start my own Google Calendar application).
I recommend keeping both your own solution and the sample solution open. This way you can switch between the examples and your own implementation.
I also recommend to use the NuGet packages:
Google.GData.AccessControl
Google.GData.Calendar
Google.GData.Client
Google.GData.Extensions
and more ...
This way you easily stay up to date.
Sample to get the users calendars:
public void LoadCalendars()
{
// Prepare service
CalendarService service = new CalendarService("Your app name");
service.setUserCredentials("username", "password");
CalendarQuery query = new CalendarQuery();
query.Uri = new Uri("https://www.google.com/calendar/feeds/default/allcalendars/full");
CalendarFeed calendarFeed = (CalendarFeed)service.Query(query);
Console.WriteLine("Your calendars:\n");
foreach(CalendarEntry entry in calendarFeed.Entries)
{
Console.WriteLine(entry.Title.Text + "\n");
}
}

Facebook C# SDK - Post to wall

I'm developing an asp.net MVC 3 Facebook app and I am trying to post a message to my wall. Here is my code:
FacebookWebClient client = new FacebookWebClient();
// Post to user's wall
var postparameters = new Dictionary<string, object>();
postparameters["message"] = "Hello world!";
postparameters["name"] = "This is a name";
postparameters["link"] = "http://thisisalink.com;
postparameters["description"] = "This is a description";
var result = client.Post("/me/feed", postparameters);
I can get the access token using client.AccessToken, so I'm assuming I don't have to set it anywhere. This code produces no errors and for the result I get an ID. However, when I bring up my Facebook, I see nothing on my wall nor in my news feed. I'm not sure what I'm missing. I've looked at related questions here at StackOverflow, but I see no reports/questions similar to mine. I've also tried changing the code based on what I've seen in other posts, but to no avail. I also checked my Facebook account settings and I see my application listed with permission to post to my wall. I also tried posting a message to my wall via the Graph API explorer and I'm getting the same result. I get an ID in return, but when I check my Facebook account I see nothing. At been at this for a couple of days. Any help would be greatly appreciated.
Thanks in advance.
[EDIT]
I wonder if something is wrong with my app generated access_token. Using this access_token, as I mentioned in my post, I get the same result using the Graph API explorer. An ID is returned, but no message on my wall. However, if I give the Graph API explorer permission to post to my wall and use its own generated access_token, I can successfully post a message using the explorer. Here's the FB login button code:
<div>
<h1>Login using Facebook</h1>
<p><fb:login-button perms="user_location, publish_stream, email"></fb:login-button></p>
</div>

Basically you need to add an additional parameter into your post parameters.
args["access_token"] = account.access_token;
this is the token of the specific page.
I wont repeat the code, follow here for example: Post On Facebook Page As Page Not As Admin User Using Facebook C# SDK
(second answer)

Did you request right App permissions to Facebook in your action method?
Try: [CanvasAuthorize(Permissions = "user_location, publish_stream, email")]

Did you append the access_token to the URL? See example here. It's also documented here (see Using the Access Token).
/me/feed?access_token=<access_token>

with one small change, your code works fine for me. you have to pass the users auth token into the constructor like this...
var client = new FacebookClient(accessToken);
// Post to user's wall
var postparameters = new Dictionary<string, object>();
postparameters["message"] = "Hello world!";
postparameters["name"] = "This is a name";
postparameters["link"] = "http://thisisalink.com;
postparameters["description"] = "This is a description";
var result = client.Post("/me/feed", postparameters);
this method works for me, although i am not sure which facebook sdk you are using.
i'm using http://facebooksdk.net/ its quite good so if you're not using it i would recommend it

facebook C# sdk- comparing from id and userid

using feed dialogue i m posting some data to wall using my app..
but when my friend go to view this feed , its shows the app for itself only..
the reason is i am checking the from id parameter in request.params bt since i m using access token to access user info in graph api, it overlaps the previous params and only code with access token is dere in request..
how to resolve it..??

Well, i dont get what you're asking about exactly , but if you post anything to any user's wall, you should get authorized first, and i think you know that already as you mentioning.
So after you get the access token, you can do that to post anything to the user's wall, assuming that you're using Facebook C# SDK as mentioned in the title:
FacebookClient fbClient = new FacebookClient("AccessToken"); //replace your access token with that..
dynamic me = fbClient.Get("/me");
Dictionary data = new Dictionary();
data.Add("message", txtStatusContent.InnerText.Trim());
fbClient.Post("/me/feed", data);
And that's it.