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using System;
using System.Collections.Generic;
using System.Linq;
 
public class Item
    {
         public DateTime Date { get; set; }
         public string UserName { get; set; }
         public int Count { get; set; } 
    }
 
public class Test
{
	public static void Main()
	{
		var datenow = DateTime.Now;
		List<Item> mojeObiekty = new List<Item>();
		mojeObiekty.Add(new Item{Date = datenow});
		mojeObiekty.Add(new Item{Date = datenow});
		mojeObiekty.Add(new Item{Date = datenow.AddDays(1)});
		var listaTupli = mojeObiekty.GroupBy(x => x.Date).Select(group => Tuple.Create(group.UserName, group.Count()));
		Console.Write(listaTupli);
	}
}

prog.cs(21,88): error CS1061: Type `System.Linq.IGrouping<System.DateTime,Item>' does not contain a definition for `UserName' and no extension method `UserName' of type `System.Linq.IGrouping<System.DateTime,Item>' could be found. Are you missing an assembly reference?
/usr/lib/mono/4.5/System.Core.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty