I have a class like this,

public class person
{
 name Name {set; get;}
 string Address {set; get;}
}

public class name
{
  string First {set; get;}
  string Last {set; get;}
}

Now when I create the object an try to set the first or last name I get an error. "Object reference not set to an instance of an object."

person Person = new person();
Person.Name.First = "John";
Person.Name.Last ="Smith";

What am I doing wrong?