System.configuration.configurationmanager Version 4.0.1.0 =link= -

Many teams move from full .NET Framework to .NET Core/5+ but want to keep their existing configuration logic. Here’s a safe migration path.

If Project C references Project B, and Project B depends on System.Configuration.ConfigurationManager , the build system must resolve which DLL to use. If a third-party library used by Project B was compiled against Version=4.0.1.0 , but your project pulls in a newer version (like 6.0.0), you may encounter a FileNotFoundException or a FileLoadException at runtime. system.configuration.configurationmanager version 4.0.1.0