editing resource of another C# application

I have two complied C# assemblies, however I'm wanting one to be able to add string resources to the second one while the second exe is not running. Sorry this question is so brief but I'm not too sure where to even start here.

Edit: Sorry, just to add - both of these compiled assemblied will be on the clients computer, so doing t开发者_如何学Gohis through Visual Studio or anything outside of the .NET framework is a bit of a no no.

Editing resources in existing .net assemblies.