C# HybridDictionary Keys

public ICollection Keys { get; }

using System;/*from   w  ww.ja  v  a 2 s.  c  o m*/
using System.Collections;
using System.Collections.Specialized;

public class SamplesHybridDictionary  {
   public static void Main()  {
      // Creates and initializes a new HybridDictionary.
      HybridDictionary myCol = new HybridDictionary();
      myCol.Add( "F", "1.49" );
      myCol.Add( "A", "1.29" );
      String[] myKeys = new String[myCol.Count];
      myCol.Keys.CopyTo( myKeys, 0 );

      for ( int i = 0; i < myCol.Count; i++ )
         Console.WriteLine( "   {0,-5} {1,-25} {2}", i, myKeys[i], myCol[myKeys[i]] );
   }
}