using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public void Main()

    {

        var examples = new List<Example>();

        var rnd = new Random();

        var step = 0.01d;

        for (double i = 0; i < 0.1; i=i+step)

        {

            var newPosition = rnd.NextDouble();

            examples.Add(new Example { Position = newPosition });

        }

​

        examples.GroupBy(x => Math.Round(x.Position, 2)).Dump();

        examples.GroupBy(x => Math.Round(x.Position / 0.05)).Dump();

    }

​

    public class Example

    {

        public double Position { get; set; }

    }

}