facebook sharing problem

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C#

C#4.0

ASP.NET4

for sharing i generated apps and get id and secret.

include this code in web.config

<configuration>
  <appSettings>
    <add key="EnableSqlDependency" value="true" />
    <add key="ApplicationId" value="<YOUR APP ID GOES HERE>" />
    <add key="ApplicationUrl" value="" />
    <add key="ApiKey" value="" />
    <add key="ApplicationSecret" value="<YOUR APP SECRET GOES HERE>" />
    <add key="ExtendedPermissions" value="offline_access" />
  </appSettings>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
  </startup>
</configuration>

and this on aspx.cs page

String fb = new FacebookClient(this.AccessToken);
dynamic result = fb.Post("me/feed", new { message = "My second wall post using Facebook C# SDK" });

but this facebookclient and post gets error.

so help me.