Register is used to use user control - ASP.NET Security
Q. If you are using user control in ASP.NET page which directory will be used?- Published on 19 Oct 15a. Register
b. Assembly
c. Implements
d. Aspx
ANSWER: Register
@register directive will be used, when you drag a user control onto your page. This directive registers your user control on the page so that the control can be accessed by the page. @Register directive informs the compiler that a user control added to the page. In ASP.NET the extension of user control is .ascx.