I think some of this thinking comes from our VFP background. Always having had a crappy project manager that made it real difficult to manage more than a few files didn't help and to this day in VFP I think long and hard about adding new files to projects because it gets out of hand so quickly. So much so I never use the proj manager in VFP... <s>

It's much easier in .NET where you can group things into sub-folders.

+++ Rick ---

>Sure you can do this but you probably shouldn't <s>. Especially in the scenario you describe because I assume there's actually a little bit of code involved in these custom controls.
>Given that in VS you can create folders and break out classes into any structure you might need it seems like it makes a lot more sense to have separate files that you can easily identify vs. having to dig through 50 classes in a single file.
>
>For the longest time, I had my Winform subclassed controls in one class file, and I thought that breaking them out was not a good idea. Then I worked on a project where someone had previously created one .cs file per control...and I wound up having to make some tweaks...and realized it wasn't the big issue that I thought it might be.