Adding order to Datatable in Ado.net

    private void AddOrder(ref DataTable dtb)
    {
        DataColumn dc = new DataColumn();
        dtb.Columns.Add("Order");
        for (int i = 1; i <= dtb.Rows.Count; i++)
        {
            dtb.Rows[i - 1]["Order"] = i;
        }
    }

Random String

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
namespace RandomString
{
    public static  class RandomString
    {
        static char[] myCharArray = new char[]
        { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
            ,'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'
            ,'0','1','2','3','4','5','6','7','8','9'
            //,'ก', 'ข', 'ค', 'ง', 'จ', 'ฉ', 'ช', 'ซ', 'ฌ', 'ญ', 'ฎ', 'ฏ', 'ฐ', 'ฑ', 'ฒ', 'ณ', 'ด', 'ต', 'ถ', 'ท', 'ธ', 'น', 'บ', 'ป', 'ผ', 'ฝ', 'พ', 'ฟ', 'ภ', 'ม', 'ย', 'ร', 'ล', 'ว', 'ศ', 'ษ', 'ส', 'ห', 'ฬ', 'อ', 'ฮ'
        };
        public static string GetRandStringMD5(string hashString)
        {
            byte[] h = ASCIIEncoding.Default.GetBytes(hashString);
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            return System.Text.Encoding.ASCII.GetString(md5.ComputeHash(h));
        }
        public static string GetRandString(int length)
        {
            string r = "";
            int maxl = myCharArray.Length;
            Random rnd = new Random();
            for (int i = 0; i < length; i++)
            {
                int rchar = rnd.Next(0,maxl);
                r += myCharArray[rchar];
            }
            return r;
        }
        public static string GetRandString(int min, int max)
        {
            string r = "";
            int maxl = myCharArray.Length;
            Random rnd = new Random();
            int maxr = rnd.Next(min, max);
            for (int i = 0; i < maxr; i++)
            {
                r += myCharArray[rnd.Next(0, maxl)];
            }
            return r;
        }
    }
}

Simple Create Child Node in XML

 
XmlDocument doc = new XmlDocument();
          doc.Load("PHP_DataAdapter.xml");
          XmlElement _aidRoot = doc.CreateElement("Adapter");
          _aidRoot.InnerXml = @"1234"
              + @""
              + @"";
          doc.DocumentElement.AppendChild(_aidRoot);
          doc.Save("PHP_DataAdapter.xml");

Quick Get DataTable Class

public static class QuickGetDataTable
{
   DataTable GetDatatable(string connectionString, string selectCommand) {
       SqlDataAdapter sda = new SqlDataAdapter(selectCommand, connectionString);
       DataTable dt = null;
       sda.Fill(dt);
       return dt;
   }
}