Dictionary<string, string> dic1 = new Dictionary<string, string>();      dic1.Add("ddd","123");       dic1.Add("aaa", "123");       dic1.Add("ccc", "123");       dic1.Add("fff", "123");       dic1.Add("eee", "123");       dic1.Add("bbb", "123");       Dictionary<string, string> dic1Asc = dic1.OrderBy(o => o.Key).ToDictionary(o => o.Key, p => p.Value);       Dictionary<string, string> dic1desc = dic1.OrderByDescending(o => o.Key).ToDictionary(o => o.Key, p => p.Value);       Dictionary<string, string> dic1Asc1         = (from d in dic1            orderby d.Key ascending            select d).ToDictionary(k => k.Key, v => v.Value);       Dictionary<string, string> dic1desc2         = (from d in dic1            orderby d.Key descending             select d).ToDictionary(k => k.Key, v => v.Value);       List<string> list = new List<string>();       list.Add("aaa");       list.Add("ddd");       list.Add("bbb");       list.Add("ccc");       list.Add("bbb");       var ascList = list.OrderBy(o => o);       var descList = list.OrderByDescending(o => o);       var ascList1 = (from l in list                       orderby l ascending                       select l).ToList();       var descList2 = (from l in list                        orderby l descending                        select l).ToList();      string str = "";