Error using string class type

My code is simple. This file is being added to a MSVC++ 6.0 program once I get past this error. Below you'll see the header and source file.

Code:

---

#ifndef READCONFIGFILEH
#define READCONFIGFILEH
#include <string>

void ReadConfig(int Values[], unsigned int *SizeValues);

#endif

---

Code:

---

//        This is ReadConfigFile.cpp

#include <cstdlib>
#include <string>
#include <iostream>
#include "ReadConfigFile.h"

void ReadConfig(int Values[], unsigned int *SizeValues)
{
        string infile("C:\\TrackerConfig.txt");
}

---

My error is:
ReadConfigFile.cpp(9): error: identifier "string" is undefined

which means it doesn't know variable infile

I have #included <string> header file so I do not know what is going wrong. I already tried #included <string.h>, which didn't help. Any advice is greatly appreciated!

Code:

---

void ReadConfig(int Values[], unsigned int *SizeValues)
{
        std::string infile("C:\\TrackerConfig.txt");
}

---

Or:

Code:

---

#include <string>
using namespace std;

---

Or:

Code:

---

#include <string>
using std::string;

---

:D

Or
http://faq.cprogramming.com/cgi-bin/...&id=1043284351