LNK2019 Error

so im learning C++ and i wanted to try creating a template class and declare it in a header file and define it in a cpp file. Easy right? Until now, yes. I have solved all but what seems to be the final problem in my code. It gives me "error LNK2019: unresolved external function" and im pretty sure it is because it is not finding the function declarations in the class cpp. I know this because i pasted the code from the class cpp into the main cpp and it compiled and ran fine but i want to do this properly. Im running Microsoft Visual C++ 2008. Ive checked that all files are included in the project. Ill show you my code and i hope someone can help

Matrix.h:

Code:

#ifndef MATRIX_H
#define MATRIX_H

template <typename T>

class Matrix
{
private:
	int mGridWidth;
	int mGridHeight;
	T *mGrid;

public:
	Matrix(int gridWidth, int gridHeight);
	~Matrix(void);
	T& operator ()(int column, int row);
	int GetWidth();
	int GetHeight();
};

#endif

Matrix.cpp:

Code:

#include "Matrix.h"

template <typename T>
Matrix<T>::Matrix(int gridWidth, int gridHeight)
	: mGridWidth(gridWidth), mGridHeight(gridHeight)
{
	mGrid = new T [mGridWidth * mGridHeight];
}

template <typename T>
Matrix<T>::~Matrix(void)
{
	delete[] mGrid;
}

template <typename T>
T& Matrix<T>::operator ()(int column, int row)
{
	return mGrid[column * mGridWidth + row];
}

template <typename T>
int Matrix<T>::GetWidth()
{
	return mGridWidth;
}

template <typename T>
int Matrix<T>::GetHeight()
{
	return mGridHeight;
}

main.cpp:

Code:

#include <iostream>
#include "Matrix.h"

int main()
{
	using namespace std;

	Matrix<double> Foo(8,8); //this line of code causes the error

	cout << "Press Enter to continue...";
	cin.get();

	return 0;
}

i hope this is enough information if you need anything else just ask and thx in advance.