How can global function exist in C#?

Question

How can global function exist in C# when everything is defined inside a class? I was reading the documentation of OpCodes.Call at MSDN, and was surprised to see the followin

Answer 1

Because System.Reflection.Emit.OpCodes.Call isn't about C#. It's about emitting IL opcodes. In IL, there are features that are not available in C#. Global functions is one of those features.