Where are the dlls -WebDriver.Common and WebDriver.Firefox in Selenium Web Driver?

I am running some tests on Selenium Web Driver. But looks like that I need some dlls like WebDriver.Common.dll, WebDriver.Firefox.dll. I had downloaded the web driver api from this link http://code.google.com/p/selenium/downloads/detail开发者_如何学编程?name=selenium-dotnet-2.1.0.zip&can=2&q= And when I unzip, could not find the dll that I mentioned in the subject.

I am using Visual Studio 2010 & creating a class library. Please let me know if there is another link to download the mentioned dll or another way to get this working.

WebDriver.Common.dll, WebDriver.Firefox.dll, and all of the other browser-specific assemblies were combined into a single WebDriver.dll assembly for the final 2.0.0 (and later) releases. You should only have to create a reference to WebDriver.dll to be able to use all of the functionality of the Selenium WebDriver API.

Another helpful step to point out is adding the proper using statements for each driver type.

For Example:

    using OpenQA.Selenium.Firefox;
    using OpenQA.Selenium.IE;
    using OpenQA.Selenium.Chrome;