Debug vs Release mode differences when storing a delegate in a hashtable

using System;

using System.Collections;

namespace DelegatesBug

{

      /// <summary>

      /// Illustrates a difference in the Release and Debug mode behavior of delegates that are

      /// contained in a hashtable. 

      /// Creates a delegate around a method and adds the delegate to a hashtable. 

      /// At that point, asking the hashtable if it contains a new delegate around the same

      /// method returns true in debug mode and false in release mode.  Running the release

      /// mode in the debugger returns true (the same result as in debug mode)

      /// </summary>

      class DelegatesBug

      {          

            [STAThread]

            static void Main(string[] args)

            {

                  Test test = new Test();

                  Hashtable hashtable = new Hashtable();

                  TestDelegate td = new TestDelegate(test.Method);

                  hashtable.Add(td, null);

                  td(); // if this call is commented out, release and debug modes work the same

                  // the Contains call returns false in release mode with no debugger (Ctrl + F5). With

                  // debug mode or the debugger enabled, it returns true.

                  Console.WriteLine("New delegate is contained in hashtable: " + hashtable.Contains(new TestDelegate(test.Method)));

                  // comparing the two delegates returns true

                  foreach (MulticastDelegate del in hashtable.Keys)

                        Console.WriteLine("The delegate from hashtable.Keys equals td: " + del.Equals(td));

                  // asking the hashtable if it contains the original delegate returns true

                  Console.WriteLine("td is contained in the hashtable: " + hashtable.Contains(td));

                  Console.ReadLine();               

            }

      }

      public delegate void TestDelegate();

      public class Test

      {

            public void Method()

            {          

            }

      }

}