How to delete old versions of a document from a document library?

   1: //Change the SPSite URL.

   2:            using (SPSite site = new SPSite(http://MossSite/sites/SiteCollection))

   3:            {

   4:                using (SPWeb web = site.OpenWeb())

   5:                {

   6:                    //Change the Document Library Name.

   7:                    SPDocumentLibrary library = (SPDocumentLibrary)web.Lists["MATTDOCLibrary"];

   8:                    foreach (SPListItem item in library.Items)

   9:                    {

  10:                        Console.WriteLine(item.Name);

  11:                        Console.WriteLine("====== BEFORE DELETION =====\n\n");

  12:                        SPFile file = (SPFile)item.File;

  13:                        int counter = item.Versions.Count;

  14:                        Console.WriteLine("counter :- " + counter);

  15:                        VersionService.Versions objVersion = new VersionService.Versions();

  16:                        objVersion.Credentials = System.Net.CredentialCache.DefaultCredentials;

  17:                        System.Xml.XmlNode ndVersion = objVersion.DeleteAllVersions(item.File.ToString());

  18:                    }

  19:                    library.Update();

  20:                    web.Update();

  21:                    foreach (SPListItem item in library.Items)

  22:                    {

  23:                        Console.WriteLine("\n" + item.DisplayName);

  24:                        Console.WriteLine("======AFTER DELETION =====\n\n");

  25:                        foreach (SPListItemVersion subitem in item.Versions)

  26:                        {

  27:                            Console.WriteLine("Version ID : " + subitem.VersionLabel.ToString());

  28:                        }

  29:                    }

  30:                }

  31:            }