C# - avoid recursion on class creation

Ok, we need the following class:
public class User
{
 public int Id; // Identifier
 public User UserCreated; // Reference to User object - user who created this User object
 public User UserUpdated; // Reference to User object - user who last updated this User object
 // Now instantiation
 // Variant 1 - bad because UserCreated and UserUpdated are both nulls on instantiaton, and getting  User from DbContext requires objects to be not null
 public User()
{
 // any other init but UserCreated / UserUpdated
}
// Variant 2 public User() - bad because of apparent flaw - endless recursion , so program will run out of memory and will crash
{
  UserCreated = new User();
  UserUpdated = new User();
}
// Variant 3 - how I did it. We postpone creation of references until they are actually used
// add internal variables
internal User _userCreated;
internal User _userUpdated;
// Properties and Accessors
public User UserCreated
{
    get
   {
      return _userCreated;
   }
   set
  {
      if ( _userCreated == null )
     {
        _userCreated = new User();
      }
     _userCreated = value;
   }
}
public User UserUpdated
{
   get
   {
      return _userUpdated;
   }
   set
   {
      if ( _userUpdated == null )
     {
         _userUpdated = new User();
      }
       _userUpdated = value;
    }
}
 public User() // like variant 1
 {
  // any other init but UserCreated / UserUpdated
 }
}

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