public static void SortDicWithLinq(){             Dictionary<DateTime, String> dd = new Dictionary<DateTime, String>();             DateTime dt = DateTime.Now;             dd.Add(dt, "bbb");             dd.Add(dt.AddDays(-1),"ccc");             dd.Add(dt.AddDays(1), "aaa");             Console.WriteLine("Org===============");             travelDicKeyDate(dd);             Dictionary<DateTime, String> dicAsc = dd.OrderBy(p => p.Key).ToDictionary(p => p.Key, p => p.Value);             Console.WriteLine("Asc===============");             travelDicKeyDate(dicAsc);             Dictionary<DateTime, String> dicDesc = dd.OrderByDescending(p => p.Key).ToDictionary(p => p.Key, p => p.Value);             Console.WriteLine("Desc===============");             travelDicKeyDate(dicDesc);         }        public static void travelDicKeyDate(Dictionary<DateTime, String> dic)         {             foreach (KeyValuePair<DateTime,String> kvp in dic)             {                 Console.WriteLine(String.Format("{0}  {1}",kvp.Key,kvp.Value));             }         }