Daily Archives: January 21, 2009

1 post
AJAX ASP.NET

System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. <% … %>)

4 comments

I got this error when I was working on a small AJAX demo project the other day. In this project I only have two TextBox controls and two AJAX CalendarExtender controls: one text box is for a begin date entry controlled by one CalendarExtender, and the other text box is for an end date entry controlled by the other CalendarExtender. Quite simple, right? However, the AJAX CalendarExtender does not have the ability to force user […]