using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<Log> logs = new List<Log>

            {

                new Log { LogID =1, LogDate = new DateTime(2014,09,23) },

                new Log { LogID =2, LogDate = new DateTime(2014,10,10) },

                new Log { LogID =3, LogDate = new DateTime(2014,09,23) },

                new Log { LogID =4, LogDate = new DateTime(2014,09,23) },

                new Log { LogID =5, LogDate = new DateTime(2014,10,10) },

                new Log { LogID =6, LogDate = new DateTime(2014,09,23) },

                new Log { LogID =7, LogDate = new DateTime(2014,09,23) },

                new Log { LogID =8, LogDate = new DateTime(2014,10,10) },

                new Log { LogID =9, LogDate = new DateTime(2014,09,23) },

                new Log { LogID =10, LogDate = new DateTime(2014,10,20) }

            };

​

            var query = logs.Where(x => x.LogDate > new DateTime(2014, 09, 20) && x.LogDate < new DateTime(2014, 10, 12))

                                .GroupBy(x => x.LogDate).Select(x => new { LogDate = x.Key, Count = x.Count() });

​

            foreach(var output in query)

            {

                Console.WriteLine("LogDate: {0}, Count : {1}",output.LogDate.ToShortDateString(),output.Count);

            }

    }

}

​

 public class Log

    {

        public int LogID { get; set; }

        public DateTime LogDate { get; set; }

    }