Avoid using same code in various pages

I'm from Lisbon-Portugal. I started my career as Computer Instructor in 1998- presentely I'm teaching Operating Systems (all except Linux, Microsoft Office Applications (all), Networking and Internet technology - as user and as programmer- to create websites - using Frontpage. In the beggining I also teached VB 5.0, so I've good knowledge of programming, but still, I feel that I need to learn more & more.
I gave my first ASP basic course (duration of 60 hours), in March/April 2003. And then I found CODEPROJECT.com, because I was looking for basics ASP, to teach them, and nowadays it is very hard to find material about ASP for begginers, so I started writing this little articles, hoping somebody will use it to teach ASP.
Still I'm a ASP begginer and quick learner trying to improve by the experience gained by others, people who started more time ago.... and I learn from their applications, try to improve them, and try to use them for teaching ASP, step by step because they are very well commented...( that is good habit, after all)
Maybe if anybody wants to share their experience, and provide me with their work, I would appreciate, it will be used for Educational purpose only.
Thanks for reading about Me.