How to fix this- No source avaliable VS2010

I am using VS 2010 Ultimate and I am just trying some stuff with the html agility pack.

when I get to one of its built in methods and hit f11 while debugging this comes up

"No Source available"

Locating source for 'C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlNode.cs'. Checksum: MD5 {a0 f7 4c 1a 17 ae da d8 ca f8 45 63 9d 43 b3 f3} The file 'C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlNode.cs' does not exist. Looking in script documents for 'C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlNode.cs'... Looking in the proj开发者_如何学JAVAects for 'C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlNode.cs'. The file was not found in a project. Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\crt\src\'... Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\src\mfc\'... Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\src\atl\'... Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\include\'... The debug source files settings for the active solution indicate that the debugger will not ask the user to find the file: C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlNode.cs. The debugger could not locate the source file 'C:\Source\htmlagilitypack\Trunk\HtmlAgilityPack\HtmlNode.cs'.

So I am guessing that maybe the .dll is closed and you can't go into it. So can I just have Vs2010 step over it if it can't go over it even if I hit F11?

Instead of when you hit F11 it tries to go in and makes a new tab up with this message?

If you download the source for the HTML Agility Pack and build it then reference the DLL that you built, you should get source available.