Append columns to DataTable : DataTable « ADO.Net « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. ADO.Net
3. DataTable

using System;
using System.Data;
using System.IO;
using System.Collections.Generic;
using System.Text;

    class Program
    {
        static DataTable dt;
        static void Main(string[] args)
        {            
            dt = new DataTable("Employees");
            dt.ReadXml("Employees.xml");
            Console.WriteLine("{0} Employees Found", dt.Rows.Count);
            foreach (DataRow row in dt.Rows)
            {
                Console.WriteLine("[{0}] {1} {2}", row["EmployeeID"], row["FirstName"], row["LastName"]);
            }
            //dt.Columns.Add("EmployeeID", typeof(int));
            //dt.Columns.Add("FirstName", typeof(string));
           // dt.Columns.Add("LastName", typeof(string));
           // dt.Rows.Add(new object[] { 1, "A", "H" });
           // dt.Rows.Add(new object[] { 2, "J", "D" });

            string[] cust = "a b c ".Split(' ');
            dt.Rows.Add(new object[] { dt.Rows.Count + 1, cust[0], cust[1] });
            dt.WriteXml("Employees.xml", XmlWriteMode.WriteSchema);
            
        } 
    }