How to find.dll in project?

The problem is probably that example.dll cannot be found because it's not stored in the current directory or in the search path given in the PATH environment variable.

I'd either copy the dll to the same directory as where your .exe resides or use the full path to the dll in the DllImport attribute rather than just the file name.

When I try to execute application it gives me following error
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System.DllNotFoundException: Unable to load DLL 'example.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
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what can be the problem?
I can understand my module can not load example.dll. I have the file example.dll stored on my pc.
can i add it again usind add references?

There's a great free utility called, Dependency Walker (depends.exe), which allows you to examine the exported functions in a dll and to see which other dlls it depends on.

This utility comes with Visual Studio but, if you can't find it, you can download a copy from here:

http://www.dependencywalker.com/

Thanks Alan for your prompt reply.

Well, is there any other way to see its content?

The DllImport attribute is only used when you are calling a function in an unmanaged dll.

So, 'example.dll' is an unmanaged dll and (unless it has been linked in as a resource) will not be included in your project's files. At runtime, the CLR will search for this dll in the usual way and, if it finds it, look in its export table for the appropriate entrypoint and then call the corresponding function.