I got the following error:

Error    1    error C2597: illegal reference to non-static member
'Microsoft::SqlServer::Server::SqlFunctionAttribute::FillRowMethodName'       
when compiling

#include "stdafx.h"

using namespace System;
using namespace System::Data;
using namespace System::Data::Sql;
using namespace System::Data::SqlTypes;
using namespace Microsoft::SqlServer::Server;
using namespace System::Collections;

// select dbo.MyUDF()
// go

public ref class AddNewUDF
{    
public:
   [SqlFunction(SqlFunctionAttribute::FillRowMethodName = "FillRow")]
    static IEnumerable^ MyUDF()
    {
        SqlTypes::SqlString Value(L"Hello");
       DataTable dt;
       dt.Rows->Add("");
       return dt.Rows;
    }

   static void FillRow(Object obj, SqlChars^ message, SqlChars^ category,
long^ instanceId)
   {
       message = gcnew SqlChars("Test");
       category = gcnew SqlChars("Test");
       instanceId = 123;
   }
};

Btw, what's the least cost way to return a one line IEnumerable object?