1: public static StringDictionary GetGAL(string UserName, string Password)

   2: {

   3:     try

   4:     {

   5:         StringDictionary ReturnArray = new StringDictionary();

   6:         DirectoryEntry deDirEntry = new DirectoryEntry("LDAP://server",

   7:                                                            UserName,

   8:                                                            Password,

   9:                                                            AuthenticationTypes.Secure);

  10:         DirectorySearcher mySearcher = new DirectorySearcher(deDirEntry);

  11:         mySearcher.PropertiesToLoad.Add("cn");

  12:         mySearcher.PropertiesToLoad.Add("mail");

  13:  

  14:         string sFilter = String.Format("(&(mailnickname=*)(|(objectcategory=user)(objectcategory=group)))");

  15:  

  16:         mySearcher.Filter = sFilter;

  17:         mySearcher.Sort.Direction = SortDirection.Ascending;

  18:         mySearcher.Sort.PropertyName = "cn";

  19:         mySearcher.PageSize = 1000;

  20:  

  21:         SearchResultCollection results;

  22:         results = mySearcher.FindAll();

  23:  

  24:         foreach (SearchResult resEnt in results)

  25:         {

  26:             ResultPropertyCollection propcoll = resEnt.Properties;

  27:             string Name = "";

  28:             string Mail = "";

  29:             foreach (string key in propcoll.PropertyNames)

  30:             {

  31:                 if (key == "cn")

  32:                 {

  33:                     foreach (object values in propcoll[key])

  34:                     {

  35:                         Name = values.ToString();

  36:                     }

  37:                 }

  38:                 else if (key == "mail")

  39:                 {

  40:                     foreach (object values in propcoll[key])

  41:                     {

  42:                         Mail = values.ToString();

  43:                     }

  44:                 }

  45:             }

  46:             if (!string.IsNullOrEmpty(Name) && !string.IsNullOrEmpty(Mail))

  47:             {

  48:                 ReturnArray.Add(Name, Mail);

  49:             }

  50:         }

  51:         return ReturnArray;

  52:     }

  53:     catch

  54:     {

  55:         return null;

  56:     }

  57: }