vb.net component

dear all,
may i know where can i get the vb.net component tutorial?

What component is that ?

what I mean is where can I get the tutorial of creating a component using vb.net

I can find tutorial to create component using VB6 but not VB.net....
any idea?

This is the best tutorial I've ever read . It explain everything about creating controls but it's in C# . Simple to be translated to VB.NET though . ;)
http://www.codeproject.com/cs/miscctrl/DividerPanel.asp

the case is like this,

I have a application program,
I need the user to used it while they online...

so...
user will browse my website...
inside my website, I should have something to check the user side have my application program or not... if not, then they need to download it.

my problem is, how can i detect users side whether they had install my program?

my friend had told me to create an active X to do that... but I'm no idea at all...

any help?
tutorial?

If I'm not wrong , then you need to create web service (never done this before thu) .