Enum from C++/CLI to C#

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C++/CLI

C#

I have the following managed class

namespace Managed_DLL
{
public ref class AController
{
    public:
        delegate void didChangeListenerStatus(tListenerStatus status);
....
}
// header file
#if defined(_MANAGED)
namespace Managed_DLL
{
#define ENUMKEYWORD public enum
#else
#define ENUMKEYWORD typedef enum
#endif

ENUMKEYWORD tListenerStatus
{
    kListenerStopped,
    kListenerRunning,
    kListenerFailed
} ;

}

I have defined the _MANAGED in the dll preprocessor defines
In C# app I have defined the didChangeListenerStatus in one of classes as

using Managed_DLL
....
public void didChangeListenerStatus(tListenerStatus status)
        {
            Console.WriteLine(" didChangeListnerStatus called");
        }

When I compile the C# app it gives the following error

Error   4   'tListenerStatus' is inaccessible due to its protection level  

Error   3   Inconsistent accessibility: parameter type 'tListenerStatus' is less accessible than method 'ADemo.ViewController.didChangeListenerStatus(tListenerStatus)

Error   6   The type or namespace name 'tListenerStatus' could not be found (are you missing a using directive or an assembly reference?)  

Please help. Thanks in advance.