Weird compiler error.

[eXeCuTeR]

I have defined a class and it's implementation in 2 seperate files, as the following:
(Server.h & Server.cpp are in a different project, and main.cpp is on a different one under one single solution - Visual Studio 2008)

Server.cpp:

Networking::Server::Server(boost::asio::io_service& io_service_, tcp::endpoint& serverEndpoint) : 
				io_service(io_service_), conAcceptor(io_service_, serverEndpoint)
{
	this->BeginAccept();
}

some other code in here.

Server.h:

namespace Networking
{
	class Server
	{
		some other code...
	public:
		Server(boost::asio::io_service& io_service_, tcp::endpoint& serverEndpoint);
                some other code...
	};
}

and main.cpp:

boost::asio::io_service io;
	Networking::Server server(io, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), 5555));
	boost::thread(boost::bind(&boost::asio::io_service::run, &io));

When I try to compile it says that there's an unresolved external:

main.obj : error LNK2019: unresolved external symbol "public: __thiscall Networking::Server::Server(class boost::asio::io_service &,class boost::asio::ip::basic_endpoint<class boost::asio::ip::tcp> &)" (??0Server@Networking@@QAE@AAVio_service@asio@boost@@AAV?$basic_endpoint@Vtcp@ip@asio@boost@@@ip@34@@Z) referenced in function _main
C:\Documents and Settings\ניב\שולחן העבודה\DESKTOP 10\RemoteDesktopBoost\Debug\FileSharing.exe : fatal error LNK1120: 1 unresolved externals

I seriously have no idea what is the problem in here, and I wouldn't care for some help.
Thanks in advance.

[eXeCuTeR]

Managed to fix it by moving it to one project unfortunately.

[Speedo]

If you want them to be in separate projects you'll need to have the first project (with the networking/server stuff) output a static or dynamic library, then have the second project link with that library.

[Lindley]

In Visual Studio, you don't need to specify the library output by project 1 explicitly as a lib input to project 2; you can simply set a Project Dependency in the solution instead.