Error Message, "The Controls Collection Cannot Be Modified Because The Control Contains Code Blocks"

Apr 16, 2010

I'm receiving this error on a page that previously worked fine, in fact the only change I've made to the page recently was to add another asp:TextBox and asp:RequiredFieldValidator control.

The page already had numerous ASP.NET controls on it, so I cannot see why these extra controls would make a difference, anyway I shall post the code below and hopefully you can see what the error is:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="MeetingGenerator.ascx.cs"
Inherits="usercontrols_MeetingGenerator" %>[code]......

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