DescendingComparer problem in SortedList

The following code is from .NET Framework 2.0 p220
it results in the following 3 errors
1      The type or namespace name 'DescendingComparer' could not be found (are you missing a using directive or an assembly reference?)      C:\Documents and Settings\xxxx\My Documents\Visual Studio 2005\Projects\SortedListDescending220\SortedListDescending220\Program.cs      
2      The best overloaded method match for 'System.Collections.SortedList.SortedList(int)' has some invalid arguments      C:\Documents and Settings\xxxx\My Documents\Visual Studio 2005\Projects\SortedListDescending220\SortedListDescending220\Program.cs
3      Argument '1': cannot convert from 'DescendingComparer' to 'int'      C:\Documents and Settings\xxxx\My Documents\Visual Studio 2005\Projects\SortedListDescending220\SortedListDescending220\Program.cs

using System;
using System.Collections;
using System.Text;
 
namespace SortedListDescending220
{
    class Program
    {
        static void Main(string[] args)
        {
            SortedList sort = new SortedList(new DescendingComparer());
            sort["First"] = "1st";
            sort["Second"] = "2nd";
            sort["Third"] = "3rd";
            sort["Fourth"] = "4th";
            foreach (DictionaryEntry entry in sort)
            {
                Console.WriteLine("{0} = {1}", entry.Key, entry.Value);
            }
 
        }
    }
}

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AstroGuyAsked:
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Göran AnderssonCommented:
You have to define the DescendingComparer class also, there is no such class in the framework.

As you are using framework 2, you should really consider using the strongly typed class SortedList<TKey, TValue> instead.
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AstroGuyAuthor Commented:
You were absolutely correct, the Class was deined earlier in the book.
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