How to use c# dll into vc++

namespace MathOperationsLib
{
    public class Math
    {
        public int Addition(int val1, int val2)
        {
            return (val1 + val2);
        } 
    }
}

#include "stdafx.h"

// Import the type library.
#import "C:\Vaibhav\C#Dll\MathOperationsLib\bin\Debug\MathOperationsLib.tlb" raw_interfaces_only

using namespace MathOperationsLib;
int _tmain(int argc, _TCHAR* argv[])
{
      HRESULT hr = CoInitialize(NULL);
      return 0;
}

[assembly: ComVisible(true)]
[assembly: AssemblyDelaySign(false)]
[assembly: AssemblyKeyFile("C:\\Vaibhav\\C#Dll\\MathOperationsLib\\MyKeyFile.SNK")]