Code snippet to add / modify columns in a list

It iterates through a whole site collection and wherever the list with name “test” it finds, It will do the changes.

    1:  using System;

    2:  using System.Collections.Generic;

    3:  using System.Text;

    4:  using Microsoft.SharePoint;

    5:   

    6:  namespace ConsoleApplication1

    7:  {

    8:      class Program

    9:      {

   10:          static void Main(string[] args)

   11:          {

   12:              using (SPSite site = new SPSite("https://ms9:101"))

   13:              {

   14:                  foreach (SPWeb web in site.AllWebs)

   15:                  {

   16:                      SPList list = web.Lists["test"];

   17:                      SPFieldCollection col = list.Fields;

   18:                      SPField field = col.GetField("Trigger");

   19:                      field.Type = SPFieldType.Choice;

   20:                      field.Update();

   21:                      col.Add("Cost", SPFieldType.Currency, false);

   22:                      

   23:                      col.Add("Due Date", SPFieldType.DateTime, false);

   24:                      list.Update();

   25:                      web.Dispose();

   26:                  }

   27:              }

   28:          }

   29:      }

   30:  }