static string RandomName(int size)
        {
            StringBuilder builder = new StringBuilder();
            char ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
            builder.Append(ch);
            for (int i = 1; i < size; i++)
            {
                ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 97)));
                builder.Append(ch);
            }
            return builder.ToString();
        }