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using System;using System.Text;namespace ConsoleApplication4{    class Program    {        public static void Main()        {            Random ran = new Random();            string s = "";            for (int i=0;i<=10;i++)            {                int RandKey = ran.Next(26)+65;                s += ((char)RandKey).ToString();               }            Console.Write(s);                        Console.WriteLine(TimeZone.CurrentTimeZone.StandardName);            OperatingSystem os = Environment.OSVersion;            Version ver = os.Version;            Console.WriteLine("Operating System: {0} ({1})", os.VersionString, ver.ToString());            /*            StringBuilder sb = new StringBuilder();            sb.Append("cxc");            sb.Append(888);            sb.Insert(2,555);            sb.Remove(2,3);            sb.Replace("cxc", "88888");            Console.WriteLine(sb);            */        }    }}

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