Passing arrays from C# to C++ library and returning an array

I am trying to wrap a C++ library for using in a C# WPF project. As part of that I need to pass and return large arrays from C# to C++ and return a large array back. Passing the array seems to be achieved like this:

namespace CppWrapper {

    public ref class CppWrapperClass
    {
    public:
        void DoStuff(int* pInt, int arraySize);
    private:        
        computingClass* pCC;
    };
}

And then called like this:

         int noElements = 1000;
         int[] myArray = new int[noElements];

         for (int i = 0; i < noElements; i++)
            myArray[i] = i * 10;

         unsafe
         {
            fixed (int* pmyArray = &myArray[0])
            {

               CppWrapper.CppWrapperClass controlCpp = new CppWrapper.CppWrapperClass();
               controlCpp.DoStuff(pmyArray, noElements);
            }

         }

How do I return an array?

Note: I would appreciate any feedback on the best way of achieving this. I am surprised it is not easier to this from C# to C++. I found it much easier wrapping the library with JNI.