A Dictionary<String, T> that ignores the case of its keys

CaseInsensitiveDictionary.cs

using System;
using System.Collections.Generic;

namespace collections
{
  public class CaseInsensitiveDictionary<T> 
  {
    private Dictionary<String, T> _dict;
    public CaseInsensitiveDictionary()
    {
        _dict = new Dictionary<String, T>(); 
    }

    public void Set(string key, T value) 
    {
      string actualKey = key.ToLower(); 
      _dict[actualKey] = value; 
    }

    public T Get(string key) 
    {
      string actualKey = key.ToLower(); 
      return _dict[actualKey];       
    }

    public T this[string key] 
    {
      get { return Get(key); }
      set { Set(key, value); }
    }
  }

}