You create new controls in markup or the designer and – they don’t show up in your code.
Even though you know the control is defined on the page you’re in red squiggly hell: So now comes the dance: You’re trying to open the markup editor, make some changes. Open the designer, move something, compile try again… The problem here is that the designer file doesn’t get re-generated if you have some sort of layout error in the page.
They’re not generic enough to put into a control of some sort or on a master page but generic enough that they get pasted around different pages and then customized for the specific page.
The big problem for me is that when I paste between pages ASP.