Facebook C# SDK FacebookApp not recognized

I am using Facebook C# SDK 5.0.1 BETA and I am trying to use the following sample code that was posted on Codeplex:

// Using dynamic (.Net 4.0 only)
var app = new FacebookApp();
dynamic me = app.Get("me");
string firstName = me.first_name;
string lastName = me.last_name;
string email = me.email;

But I cannot get VS to recognize FacebookApp(开发者_如何学JAVA). I downloaded the SDK today (Feb. 9th 2011) and made sure to unblock or unlock all the dlls. I am running the code off of my C drive and am running VS2010 as an admin. I am using VS 2010 with the 4.0 Framework (NOT client). If I dont use the above code snippet the project builds and runs but I cannot get the FB login button to display (that is 2nd issue). What is weird is that if I copy the URL (http://localhost:5000/Account/Login.aspx) into Firefox the login button displays and then I can log into Facebook and (I think) get authorized. Oh, I believe I do have the app setup correctly in Facebook and copied the AppId and AppSecrect into the config file. And I am using IE 8. Any suggestions? Thanks.

Try to download it again. The current version is 5.0.3. Also, the documentation is in need of some updates. We have renamed the class FacebookApp to FacebookClient.

I have updated the documentation page: http://facebooksdk.codeplex.com/wikipage?title=Code%20Examples

I have the same problem when I get the binaries from the download section of the site with 5.0.2 and 5.0.3

I'm going to get the code and build it next to see if i find FacebookApp, but it is not there in the donwload versions.