can i add a new aspx file to DNN?

i added someone, but when browsing it, the DNN redirect the request to the default page of the portal.

how to deal with it?

could y help me?

If you haven't already, get the DNN development templates on DNN Jungle and incorporate them into your Visual Studio.

Then, when you add a new project use the template to build all the files in the project directory.  Then when you build your page as a module, just inherit DNN resources.

You can then call all the DNN functions, including navigateURL().  It has several variations that allow you to call other modules, etc.

The thing is, if you're trying to integrate the application or page into DNN you basically need to make it into a module. I'm going through the same stuff myself. The process to do it, is kind of straight forward but does get you into many issues depending on what you're trying to do. For me I'm actually replacing an existing auth system so I'm going through hell. This is the basic steps you can follow to get started.

Start opening your installed DNN Solution with VS
Add your project to the DNN Solution
Open the BuildSupport Project in DNN and add a reference to your project
rt-clck the solution and open the configuration manager and uncheck all of the projects except buildsupport and yours
Add your aspx, aspx.cs and aspx.cs.resx files to your projecct (assuming you're using C#)
Then rename your aspx file to ascx (the others will change automatically)
Now, for the main changes.....

Open the ascx file and only keep what is in between your <form> and </form> lines. Just delete everything else.
Recreate your code line with:

<%@ Control language="c#" Codebehind="AllBundleList.ascx.cs" AutoEventWireup="false" Inherits="TangentApps.MessageManager.bundle.AllBundleList" %><%@ Control language="c#" Codebehind="pagename.ascx.cs" AutoEventWireup="false" Inherits="fullclassname" %>

where pagename is the name of the code behind page and the full class name is yours. My line looks like this

<%@ Control language="c#" Codebehind="AllBundleList.ascx.cs" AutoEventWireup="false" Inherits="TangentApps.MessageManager.bundle.AllBundleList" %>

Now open the ascx.cs file and put in your code. Add the DNN things like

using DotNetNuke;
using DotNetNuke.Common;
using DotNetNuke.Common.Utilities;
using DotNetNuke.Entities;
using DotNetNuke.Entities.Users;
using DotNetNuke.Entities.Modules;
using DotNetNuke.Services.Localization;
using DotNetNuke.Services.Exceptions;

and your public class line to have