hope this short code will help you
Dictionary<string,string> fbParams = new Dictionary<string,string>();
fbParams["message"] = Title;
fbParams["caption"] = string.Empty;
fbParams["description"] = string.Empty;
fbParams["req_perms"] = "publish_stream";
fbParams["scope"] = "publish_stream";
//Initialize Your Facebook Client in the manner that suits you, I did it by supplying a saved access token from a single users
FacebookWebClient fbClient = new FacebookWebClient(<YOUR_ACCOUNT_ACCESS_TOKEN>);
//Get the listing of accounts associated with the user
dynamic fbAccounts = fbClient.Get("/me/accounts");
//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 == <DESTINATION_ID_OF_YOUR_FAN_PAGE>) {
//When you find it, grab the associated access token and put it in the Dictionary to pass in the FB Post, then break out.
fbParams["access_token"] = account.access_token;
break;
}
}
//Then pass your destination ID and target along with FB Post info. You're Done.
dynamic publishedResponse = fbClient.Post("/" + <DESTINATION_ID_OF_YOUR_FAN_PAGE> + "/feed", fbParams);
===================================
fbParams["access_token"] = account.access_token;
this line will get you access to write on this page