How to force a C# root namespace throughout project files for when none is coded?

Question

I want to force a root namespace on the contents of any .cs source files that don't have their contents wrapped in an explicit namespace. In other words I want to keep classes and other namespace-level structures out of the default namespace.
(Working inside a Windows .NET environment with Visual Studio)

In the following example, I want to force the Car class into the MotorIndustry namespace by default even though it has no explicit namespace coded.

Vehicle.cs (has namespace)

namespace MotorIndustry {
    public class Vehicle {
        // ...
    }
}

Car.cs (no namespace/default)

public class Car : Vehicle {
    //...
}

Is there a way to accomplish this "root namespace" modification behaviour through project settings in Visual Studio, AssemblyInfo.cs file or some other means?

My understanding is VB.NET has a feature like this but C# acts differently?

Some context about why am I asking this: I have hundreds of classes and the programmer forgot to wrap the namespace around some. When I reference the assembly from other projects it's polluting the default namespace with classes that end up causing some ambiguous situations.

Answer 1

Use ReSharper to move the classes into the proper namespace. In fact, version 5.0 (still in Beta) allows you to correct namespaces globally.

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The other way to do it is to make the other developer fix the code.

Answer 2

It sounds like you are trying to replicate VB.Net's project namespace feature in C#. This is not a supported feature of the C# compiler or IDE. You will not be able to create one by modifying a project file. You will need to add the namespace to every file in the project either manually or via a tool.