using System;
using System.Text;
using System.DirectoryServices;

namespace activeDirectoryLdapExamples
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Enter user      : ");
            String username = Console.ReadLine();

            try
            {
                DirectoryEntry myLdapConnection = createDirectoryEntry();

                DirectorySearcher search = new DirectorySearcher(myLdapConnection);
                search.Filter = "(cn=" + username + ")";
                search.PropertiesToLoad.Add("title");

                SearchResult result = search.FindOne();

                if (result != null)
                {
                    // create new object from search result

                    DirectoryEntry entryToUpdate = result.GetDirectoryEntry();

                    // show existing title

                    Console.WriteLine("Current title   : " + entryToUpdate.Properties["title"][0].ToString());
                    Console.Write("\n\nEnter new title : ");

                    // get new title and write to AD

                    String newTitle = Console.ReadLine();

                    entryToUpdate.Properties["title"].Value = newTitle;
                    entryToUpdate.CommitChanges();

                    Console.WriteLine("\n\n...new title saved");
                }

                else Console.WriteLine("User not found!");
            }

            catch (Exception e)
            {
                Console.WriteLine("Exception caught:\n\n" + e.ToString());
            }
        }

        static DirectoryEntry createDirectoryEntry()
        {
            // create and return new LDAP connection with desired settings

            DirectoryEntry ldapConnection = new DirectoryEntry("rizzo.leeds-art.ac.uk");
            ldapConnection.Path = "LDAP://OU=staffusers,DC=leeds-art,DC=ac,DC=uk";
            ldapConnection.AuthenticationType = AuthenticationTypes.Secure;
            return ldapConnection;
        }
    }
}