I was trying to implement two functionalities in asp.net with vb.net.

Somehow it's working if I build website using Ctrl + F5 (ASP.NET development server) but it doesn't work if I just use regular way.

 One function is to create virtual directory in IIS using vb.net. Souce code address is http://www.vbforums.com/printthread.php?t=347207

The other one is to send email using system.net.mail. Source address is http://forums.asp.net/thread/1225569.aspx

Both of them works only on ASP.NET development server but on IIS server of windows xp pro sp2.

Is this some kind of setting problem? 

 I have installed visual studio 2005, sql 2005 studio, framework 2.0.

Did anyone have same experience?

ASP.NET Development Server

Visual Studio 2005 ships with a new Web server called ASP.NET Development Server. (This Web server was previously known as Cassini.) 

There are several benefits of the ASP.NET Development Server.

• It is now possible for non-Administrators to develop and debug against a Web server.
• The ASP.NET Development Server dynamically maps virtual directories to any location in the file system allowing for flexible project locations.
• Users on Windows XP Professional who are already using IIS will now be able to create new Web applications that will not affect the file or folder structure of their Default Web Site in IIS.

No special configuration is required to take advantage of the ASP.NET Development Server.  When a Web project that is hosted on the file system is debugged or browsed, Visual Studio 2005 will automatically start an instance of the ASP.NET Development Server on a random port to service the request.

I appreciate your help.

 I don't know what's wrong with mine.

Mailer is working..I don't know what was wrong with it yesterday. I didn't change anything.

Virtual Directory is not working still. You didn't have to change any permission right?

No, I am trying to do it programatically in VB.NET.

The link I provided above has full source code(asp.net with vb.net) to make virtual directory programatically. And it works.

But it only works for development server (build with Ctrl + F5 in visual studio). With IIS 5.1 (came with win xp pro) gives me access denied error.

It will help me really a lot if you can explain about this to me. 

 It doesn't take long at all (It's got full source code and no additional work) 

 Please help me find out why it's not working with IIS 5.0.

You said both source worked for you. Do you mind if ask you for the enviroment when you ran the sources?

 Were you using win xp with iis 5 or windows server 2003 with iis 6?

To be able to access the metabase to create the web application, your app will need administrator rights. That won't happen for your application if anonymous authentication is turned on, so turn it off and make sure users are required to authenticate before using the page.

If you are wanting to provision stuff for users who signup for some kind of service, then I'd suggest you look at MPS http://forums.asp.net/167/ShowForum.aspx