using System;
using System.Linq;
using System.Collections.Generic;
 
public class Test
{
public class BtnCountViews {
    public int DayOfYear { get; set; }
    public int BtnCount { get; set; }
    public int Views { get; set; }
}
 
    public static void Main() {
        var rnd = new Random();
        List<BtnCountViews> items = Enumerable
            .Range(1, 10)
            .Select(_ => new BtnCountViews {DayOfYear = rnd.Next(20, 200)})
            .ToList();
        items.Sort((x, y) => x.DayOfYear.CompareTo(y.DayOfYear));
        Console.WriteLine("Before: {0}", string.Join(", ", items.Select(x => x.DayOfYear)));
        int i = items.Count-1;
        while (i > 0) {
            if (items[i].DayOfYear == items[i-1].DayOfYear+1) {
                i--;
            } else {
                items.Insert(i, new BtnCountViews { DayOfYear = items[i].DayOfYear-1 });
            }
        }
        Console.WriteLine("After: {0}", string.Join(", ", items.Select(x => x.DayOfYear)));
 
    }
}

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