how to exchange values between severaly projects types ?

Hi every body ; i created a new soluation and add a new Console project using vc  like this :

class r
{
    int x,y;
   r()
{
    x=4;y=5;
}
}

int main()
{
}

then i created anew windows application project using  c# in the same soluation  ; my question is how to create instance of this class created in vc project to use them in c# application ; thanks