Obfuscate Winform and its external dependencies (dlls)

I have a .NET winform which calls several methods from an external .NET DLL. I obfuscated the winform no issue. But when I obfuscated the DLL, my Winform doesn'开发者_如何学JAVAt run anymore.

Any idea how to protect the winform and the external DLL from reflector?

Thanks!

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Since you've obfuscated both the winforms app and the DLL, I assume that means you have access to the source code for both. If so, try incorporating the DLL into your winforms app as code (rather than as a DLL reference) and then obfuscating the whole thing.