ASP.NET 2.5 prefixing ctl00 and ASP.NET 4 not prefixing ctl00

Question

Does anyone know why ASP.NET 4 has dropped the ctl00 prefix on ASP controls?

Is there a setting I have missed?

Answer 1

If you just want to add 'ct100' prefix to your control's IDs, add Master page to your WebPage. But how said above, try to avoid using hardcode with controls ids in your sources and read Metthew's comments for generation custom ID