VC++ 6.0 and #include<sstring>

[7stud]

I was trying to use the stringstream class to convert numbers to strings, and I got an error saying the <sstream> file could not be found:

#include<iostream>
#include<string>
#include<sstring>

using namespace std; 	

int main()
{

	string data;
	ostringstream outStr(data);

	//Data to be converted to a string:
	int num1= 50;
	double num2 = 123.6;

	outStr<<num1<<" "<<num2<<" ";
	cout<<data<<endl;

	return 0;
}

C:\Beginning C++\test\test.cpp(3) : fatal error C1083: Cannot open include file: 'sstring': No such file or directory