Errors creating a string in c++

Programmer Question

Whenever I try to create a string in my header file I get the error: 'string' is not a member of 'std'. I am using the Microsoft Visual c++ express 2010 compiler. Here is my header file:

using namespace std;

class Person
{
private:
 string name;
 string p_number;

public:
 Person();
 Person(string, string);
 string get_number();
 string get_name();
};

I am a decent java programmer who just started learning c++

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