getline: identifier not found

I have problem with getline().

I tried many examples and read other solutions, but that didn’t solve my problem. I still have information 'getline: identifier not found'.

I included <stdio.h> <tchar.h> <iostream> <conio.h> <stdlib.h> <fstream> and still nothing.

#include "stdafx.h"

using namespace std;

int main(int argc, _TCHAR* argv[])
{
    string line;
    getline(cin, line);
    cout << "You entered: " << line << endl;
}

What do I need to do now?

I use Windows 7 64 bit and Visual Studio 2013.