Multiple choice technology web technology Extension for Active Server Custom Control? ASCX ASPX ASHX ASMx Reveal answer Fill a bubble to check yourself A Correct answer Explanation Active Server Custom Controls in ASP.NET use the .ascx extension. ASCX files contain user controls that can be reused across multiple ASP.NET pages. ASPX is for regular pages, ASHX is for handlers, and ASMx is a typo.