Namespace Rule of Thumb

Question

Is there a general rule of thumb as to how many classes, interfaces etc should go in to a given name space before the items should be further classfied in to a new name space? Like a best practice or a community preference? Or is this all personal preference?

namespace: MyExample.Namespace
 interface1
 interface2
 interface3
 interface4
 interface5
 interface6
 interface7
 interface8
 interface9

Or

namespace: MyExample.Namespace.Group1
 interface1
 interface2
 interface3
namespace: MyExample.Namespace.Group2
 interface4
 interface5
 interface6
namespace: MyExample.Namespace.Group3
 interface7
 interface8
 interface9

Answer 1

I have not seen any rule of thumb at any reliable source but there are a few common preferences that I haven seen while working with most developers. There are a few things that help you make the namespaces.

1. Domain of the class
2. Is it a class or an interface (I have seen some developers prefer namespaces like ShopApp.Model.Interfaces ). Works really well if your interfaces are some service or data contract.
3. Dont have namespaces that are too deep, 3 (.) is enough. More than that may get annoying.
4. Be open to reorganize namespace if at anytime u feel it has become illogical or hard to manage.
5. Do not create namespaces just for the sake of it.