Programatically adding column to sharepoint list, code to add column to list

Create new console application in VS and add following code in program.cs file. also add refrence to Microsoft.Sharepoint.dll


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;
namespace AddColumntoList
{
    class Program
    {
        static void Main(string[] args)
        {
            do
            {
                try
                {
                    Console.WriteLine("--Add Column to list--");
                    Console.WriteLine("Enter Site URL : ");
                    String str_siteurl = Console.ReadLine();
                    using (SPSite siteColl = new SPSite(str_siteurl))
                    {
                        Console.WriteLine("Site Found");
                        siteColl.AllowUnsafeUpdates = true;
                        using (SPWeb rootweb = siteColl.OpenWeb())
                        {
                            rootweb.AllowUnsafeUpdates = true;
                            //Console.WriteLine("Site Found");
                            Console.WriteLine("Enter List Name: ");
                            string listName = Console.ReadLine();
                            SPList testList = rootweb.Lists[listName];
                            Console.WriteLine("list Found");
                            Console.WriteLine("Enter Column Name: ");
                            String colName = Console.ReadLine();
                            Console.WriteLine("Select Type Of Column:-");
                            Console.WriteLine("1. Single line Text");
                            Console.WriteLine("2. MultiLine Text");
                            Console.WriteLine("Enter Choice number:- ");

                            string typeChoice = Console.ReadLine();
                            switch (typeChoice)
                            {
                                case "1":
                                    SPFieldText newcolumn = (SPFieldText)testList.Fields.CreateNewField(SPFieldType.Text.ToString(), colName);
                                    testList.Fields.Add(newcolumn);
                                    break;
                                case "2":
                                    SPFieldMultiLineText newcolumnMul = (SPFieldMultiLineText)testList.Fields.CreateNewField(SPFieldType.Note.ToString(), colName);
                                    testList.Fields.Add(newcolumnMul);
                                    break;
                            }



                            //    newcolumn.Required = false;
                            //newcolumn.Description = "comma seperated value";
                            //testList.Fields.Add(newcolumn);
                            testList.Update();
                            Console.WriteLine("Column Created");

                            Console.WriteLine("Add Colum to Default View y/n??? :-");
                            string defChoice = Console.ReadLine();
                            if (defChoice == "y" || defChoice == "Y")
                            {
                                SPView defView = testList.DefaultView;
                                defView.ViewFields.Add(colName);
                                defView.Update();
                                Console.WriteLine("Column added to default view");
                            }
                            rootweb.AllowUnsafeUpdates = false;
                        }
                        siteColl.AllowUnsafeUpdates = false;
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine("ERROR : " + ex.Message);
                    Console.WriteLine("Press Enter to Continue and ESC to exit...");
                }
            } while (Console.ReadKey(true).Key != ConsoleKey.Escape);
            Console.WriteLine("Press Enter to Exit...");
            Console.ReadLine();
        }
    }
}