if you are using VS.NET, in Solution Explorer, right click on References node, select Add....or try<%@ Page Language="vb" %> <%@ Import Namespace="System.DirectoryServices" %> <%@Assembly Name="System.DirectoryServices, Version=1.0.3300.0,Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"%>
<%@ Import Namespace="System.DirectoryServices" %>
<%@Assembly Name="System.DirectoryServices, Version=1.0.3300.0,Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"%>