RE: i'm a C++ beginer and i have a question.

CLR Class Library
In my head file:

using namespace System;
using namespace System::Xml;
using namespace System::Net::Mail;
namespace CPTest {

    public ref class clsSendMail
    {
    public:
        void getMailMessage(String^ v_Content);
        void doSendMail();
    private:
        String^ v_MailContent;
        MailMessage objMailMessage;
    };
}

In my cpp File:

#include "stdafx.h"
#include "CPTest.h"
void getMailMessage(String^ v_Content)
{
        objMailMessage= gcnew MailMessage("aa@aa.aa","aa@aa.aa","test
mail",v_Content);
        return ;
}
..............

my question is :
1.why compiler told me "'objMailMessage' : undeclared identifier"?

2.In .Net class, when define an object of System::String. i have a problem
just like this below.
(for example:
   "String^ a;" is correct.
   But why "String a;" is wrong.)