C# reflection: How to load multiple assemblies in different folders

My code uses Assembly.LoadFrom to load the main assembly, and uses reflection to inspect the types and functions in this assembly. This assembly references some other assemblies which are in different folders. When my code tries to inspect the types defined in those other assemblies, FileNotFoundException is thrown.

I can't use app.config setting to solve this problem. It all has to be done programmatically.

How do I solve this problem?