private static void Rand()
        {
            var arr = new List<string>();
            for (int i = 0; i < 10; i++)
            {
                arr.Add(i.ToString());
            }
            for (int i = 65; i < 91; i++)
            {
                arr.Add(Encoding.GetEncoding("ASCII").GetString(new byte[] { (byte)i }));
            }
            var rnd = new Random();
            for (int i = 0; i < 4; i++)
            {
                var r = rnd.Next(0, 35);
                Console.Write(arr[r]);
            }
        }

 

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