Extensions.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace ExtensionMethods
{
    public static class Extensions
    {
        private static readonly Random rand = new Random();

        public static void Shuffle<T>(this IList<T> list)
        {
            int n = list.Count;
            while (n > 1)
            {
                n--;
                int k = rand.Next(n + 1);
                T value = list[k];
                list[k] = list[n];
                list[n] = value;
            }
        }

        public static T RandomItem<T>(this IList<T> list)
        {
            var index = rand.Next(list.Count);
            return list[index];
        }

        public static string ToUpperFirstLetter(this string source)
        {
            if (string.IsNullOrEmpty(source))
            {
                return string.Empty;
            }
            char[] letters = source.ToCharArray();

            letters[0] = char.ToUpper(letters[0]);

            return new string(letters);
        }

        public static string RemoveAccent(this string txt)
        {
            byte[] bytes = Encoding.GetEncoding("Cyrillic").GetBytes(txt);
            return Encoding.ASCII.GetString(bytes);
        }

    }
}