[tigershark]

Regardless of the use case this is what the official documentation says about namespaces:

The namespace keyword is used to declare a scope that contains a set of related objects. You can use a namespace to organize code elements and to create globally unique types.

And about partial classes:

There are several situations when splitting a class definition is desirable: When working on large projects, spreading a class over separate files enables multiple programmers to work on it at the same time. When working with automatically generated source, code can be added to the class without having to recreate the source file. Visual Studio uses this approach when it creates Windows Forms, Web service wrapper code, and so on. You can create code that uses these classes without having to modify the file created by Visual Studio.

As you can see partial classes are not the right tool to organise code.

[psyc]

How would you propose to split a struct that has a single data member? Say, a struct where the only data is one unsigned short?

Also, "regardless of the use case" ? I barely know how to respond to that. Have a little imagination.