using System; using System.DirectoryServices; public class AddProperty { public static void Main() { DirectoryEntry de = new DirectoryEntry( "LDAP://192.168.1.100/cn=kblum, ou=sales, dc=ispnet1, dc=net", "cn=Administrator, dc=ispnet1, dc=net","password", AuthenticationTypes.ServerBind); de.Properties["telephoneNumber"].Add("(111)222-3333"); de.Properties["telephoneNumber"].Add("(444)555-6666"); de.CommitChanges(); de.Close(); } }