Web Parts with a markup file?

I'm an ASP.NET web part novice. I've built a few simple ones using only a class that derived from WebPart and overriding the CreateChildControls method, but nothing really very substantial. My question is whether it's possible to have a web part that also takes advantage of a separate html/asp.net markup file that will help provide some structure to the web part's output. In the past I just created server controls and added them to the controls collection, but this seems like a silly way to try to create a non-trivial layout. Can I do this? Do I have to use an ascx user control or can I bypass that step? There are a lot of hello world tutorials on web parts out there, but none seem to go past the CreateChildControls override. Thanks!

From stackoverflow

• Yes, there is. Go here to learn about templated web parts, and go here to see all of the info he has on WebParts. I used this technique back in 2004/2005 and it worked very well.