Deleting all items from lists

Scenario:
Often during data migration we need to do clean up list data. I had something similar but there were multiple lists and each list with 5000-10000 records.

Solution:
Quick console application did the trick of cleaning all the lists.
>> Create a new console application and add reference to Microsoft.SharePoint.dll
>> Use the below code.

Code: [ Applies To : WSS3.0 / Sharepoint 2010 Foundation ]

using System;
using Microsoft.SharePoint;
using System.Collections.Generic;
using System.Text;

namespace SKN.CleanSPLists
{
    class Program
    {
        static void Main (string[] args)
        {
            string webUrl = "http://ws2003";
            bool deleteFromRecycleBin = true;
            List<string> listNames = new List<string>();
            listNames.Add("List Title 1");
            listNames.Add("List Title 2");
            listNames.Add("List Title 3");
            listNames.Add("List Title 4");

            using (SPSite site = new SPSite(webUrl))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    foreach (var listName in listNames)
                    {
                        SPList list = web.Lists[listName];

                        Console.WriteLine("Purging list: " + list.Title);
                        Console.WriteLine("Base Type: " + list.BaseType.ToString()); 
                        
                        StringBuilder sbDelete = BuildBatchDeleteCommand(list);
                        web.ProcessBatchData(sbDelete.ToString());

                        Console.WriteLine("Done cleaning list : Presss a key to continue with next list."); 
Console.WriteLine("");
                        Console.ReadKey();
                    }

      
                    if (deleteFromRecycleBin)
                    {
                       Console.WriteLine("Cleaning Recycle bin");
   web.RecycleBin.DeleteAll();
                        site.RecycleBin.DeleteAll();
                      Console.WriteLine("Done cleaning Recycle bin");
                      Console.ReadKey();
                    }                 
                }
            }
        }
      

        /// <summary>
        /// Builds a batch string with a list of all the items that are to be deleted.
        /// </summary>
        /// <param name="spList"></param>
        /// <returns></returns>
        private static StringBuilder BuildBatchDeleteCommand (SPList spList)
        {
            StringBuilder sbDelete = new StringBuilder();
            sbDelete.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?><Batch>");
            string command = "<Method><SetList Scope=\"Request\">" + spList.ID +
                "</SetList><SetVar Name=\"ID\">{0}</SetVar><SetVar Name=\"Cmd\">Delete</SetVar></Method>";

            foreach (SPListItem item in spList.Items)
            {
                sbDelete.Append(string.Format(command, item.ID.ToString()));
            }
            sbDelete.Append("</Batch>");
            return sbDelete;
        }
    }
}

Article: Batch command , SP List Delete