static void Main(string[] args)
    {
        SetGet sgobj = new SetGet();
        // pass your SetGet object to the login constructor
        Login login = new Login(sgobj);

        // call the method to set the login message
        login.header_message();
        // print the login message
        Console.WriteLine(sgobj.Heading);
        Console.ReadKey();
    }
 // accept a SetGet object and store it in the login instance
 public Login(SetGet setobj)
 {
     this.setobj = setobj;
 }