using System; using System.DirectoryServices; class MainClass { 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["sn"][0] = "new Value"; de.CommitChanges(); Console.WriteLine("New property value: {0}", de.Properties["sn"][0]); de.Close(); } }