Puzzle 1: Passing reference types by value (Beginner)

 1: public class ValueRef

 2: {

 3:         public static void Problem()

 4:         {

 5:             StringBuilder myStrBuilder = new StringBuilder("x");

 6:             AppendHello(myStrBuilder);

 7:             Console.WriteLine(myStrBuilder.ToString());

 8:             Console.ReadLine();

 9:         }

10:

11:         static void AppendHello(StringBuilder builder)

12:         {

13:             builder.Append("hello");

14:             builder = null;

15:         }

16: }

 1: public class ValueRef

 2: {

 3:         public static void Problem()

 4:         {

 5:             StringBuilder myStrBuilder = new StringBuilder("x");

 6:             AppendHello(myStrBuilder);

 7:             Console.WriteLine(myStrBuilder.ToString());

 8:             Console.ReadLine();

 9:         }

10:

11:         static void AppendHello(StringBuilder builder)

12:         {

13:             builder.Append("hello");

14:             builder = null;

15:         }

16: }