using System;
using System.Collections;

public class Int16Collection : CollectionBase  {

   public Int16 this[ int index ]  {
      get  {
         return( (Int16) List[index] );
      }
      set  {
         List[index] = value;
      }
   }

   public int Add( Int16 value )  {
      return( List.Add( value ) );
   }

   public int IndexOf( Int16 value )  {
      return( List.IndexOf( value ) );
   }

   public void Insert( int index, Int16 value )  {
      List.Insert( index, value );
   }

   public void Remove( Int16 value )  {
      List.Remove( value );
   }

   public bool Contains( Int16 value )  {
      // If value is not of type Int16, this will return false.
      return( List.Contains( value ) );
   }

   protected override void OnInsert( int index, Object value )  {
      if ( value.GetType() != Type.GetType("System.Int16") )
         throw new ArgumentException( "value must be of type Int16.", "value" );
   }

   protected override void OnRemove( int index, Object value )  {
      if ( value.GetType() != Type.GetType("System.Int16") )
         throw new ArgumentException( "value must be of type Int16.", "value" );
   }

   protected override void OnSet( int index, Object oldValue, Object newValue )  {
      if ( newValue.GetType() != Type.GetType("System.Int16") )
         throw new ArgumentException( "newValue must be of type Int16.", "newValue" );
   }

   protected override void OnValidate( Object value )  {
      if ( value.GetType() != Type.GetType("System.Int16") )
         throw new ArgumentException( "value must be of type Int16." );
   }

}


public class SamplesCollectionBase  {

   public static void Main()  {
 
      // Creates and initializes a new CollectionBase.
      Int16Collection myI16 = new Int16Collection();

      // Adds elements to the collection.
      myI16.Add( (Int16) 1 );
      myI16.Add( (Int16) 2 );
      myI16.Add( (Int16) 3 );
      myI16.Add( (Int16) 5 );
      myI16.Add( (Int16) 7 );

      // Displays the contents of the collection using the enumerator.
      Console.WriteLine( "Initial contents of the collection:" );
      PrintIndexAndValues( myI16 );

      // Searches the collection with Contains and IndexOf.
      Console.WriteLine( "Contains 3: {0}", myI16.Contains( 3 ) );
      Console.WriteLine( "2 is at index {0}.", myI16.IndexOf( 2 ) );
      Console.WriteLine();

      // Inserts an element into the collection at index 3.
      myI16.Insert( 3, (Int16) 13 );
      Console.WriteLine( "Contents of the collection after inserting at index 3:" );
      PrintIndexAndValues( myI16 );

      // Gets and sets an element using the index.
      myI16[4] = 123;
      Console.WriteLine( "Contents of the collection after setting the element at index 4 to 123:" );
      PrintIndexAndValues( myI16 );

      // Removes an element from the collection.
      myI16.Remove( (Int16) 2 );

      // Displays the contents of the collection using the index.
      Console.WriteLine( "Contents of the collection after removing the element 2:" );
      for ( int i = 0; i < myI16.Count; i++ )  {
         Console.WriteLine( "   [{0}]:   {1}", i, myI16[i] );
      }

   }
 
   public static void PrintIndexAndValues( Int16Collection myCol )  {
      int i = 0;
      System.Collections.IEnumerator myEnumerator = myCol.GetEnumerator();
      while ( myEnumerator.MoveNext() )
         Console.WriteLine( "   [{0}]:   {1}", i++, myEnumerator.Current );
      Console.WriteLine();
   }
}


/* 
This code produces the following output.

Initial contents of the collection:
   [0]:   1
   [1]:   2
   [2]:   3
   [3]:   5
   [4]:   7

Contains 3: True
2 is at index 1.

Contents of the collection after inserting at index 3:
   [0]:   1
   [1]:   2
   [2]:   3
   [3]:   13
   [4]:   5
   [5]:   7

Contents of the collection after setting the element at index 4 to 123:
   [0]:   1
   [1]:   2
   [2]:   3
   [3]:   13
   [4]:   123
   [5]:   7

Contents of the collection after removing the element 2:
   [0]:   1
   [1]:   3
   [2]:   13
   [3]:   123
   [4]:   7

*/