I am trying to understand how to assign by "reference" to a class field in c#.

I have the follwing example to consider:

 public class X
 {

  public X()
  {

   string example = "X";

   new Y( ref example );

   new Z( ref example );

   System.Diagnostics.Debug.WriteLine( example );

  }

 }

 public class Y
 {

  public Y( ref string example )
  {
   example += " (Updated By Y)";
  }

 }

 public class Z
 {

  private string _Example;

  public Z( ref string example )
  {

   this._Example = example;

   this._Example += " (Updated By Z)";

  }

 }

 var x = new X();

When running the above code the output is:

X (Updated By Y)

And not:

X (Updated By Y) (Updated By Z)

As I had hoped.

It seems that assigning a "ref parameter" to a field loses the reference.

Is there any way to keep hold of the reference when assigning to a field?

Thanks.