How To Use Google AdWord Api in our .net Application ?

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.NET

.NET4

I am Unable o use Google addwords API in Google API Example.
When I run the Example it Gives Following Error:

Call stack location:
Google.AdWords.dll!Google.Api.ads.AdWords.Lib.AdWordsUser.AdWordsUser() Line 36
Source File Information:
Locating source for 'c:\src\MyProjects\now\Common library base\adwords\compile\Lib\AdWordsUser.cs'. Checksum: MD5 {3a 6 dc e6 d 4e fe c2 79 5b ef 21 9c 17 f1 86}
The file 'c:\src\MyProjects\now\Common library base\adwords\compile\Lib\AdWordsUser.cs' does not exist.
Looking in script documents for 'c:\src\MyProjects\now\Common library base\adwords\compile\Lib\AdWordsUser.cs'...
Looking in the projects for 'c:\src\MyProjects\now\Common library base\adwords\compile\Lib\AdWordsUser.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:\src\MyProjects\now\Common library base\adwords\compile\Lib\AdWordsUser.cs.
The debugger could not locate the source file 'c:\src\MyProjects\now\Common library base\adwords\compile\Lib\AdWordsUser.cs'.


Please Help!!!!

Thanks In Advance...