using System;

​

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

              List<string> myCol = new List<string>{ "RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED" };

​

      Console.WriteLine( "Initial contents of the StringCollection:" );

​

      // Checks whether the collection contains "orange" and, if so, displays its index.

      if ( myCol.Contains( "orange" ) )

         Console.WriteLine( "The collection contains \"orange\" at index {0}.", myCol.IndexOf( "orange" ) );

    }

}