C# - Form Control ID Is Null On Enumeration?

Apr 2, 2011

I have a simple ASP.Net page, and I am enumerating through the controls doing things to the controls via reflection (localising the page - but that is whole other can of managerial dictat type worms). So...I have a test page thus:

<%@ Page Title="" Language="C#" MasterPageFile="~/Master Pages/Root.master" AutoEventWireup="true" CodeFile="refelectiontest.aspx.cs" Inherits="refelectiontest" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Button ID="Button1" runat="server" Text="Button" />

[Code]....

Now, if I just run this, it barfs with an object null exception. And if I step through the code, putting a breakpoint on the control.ID line, then indeed the ID is null. However, if I then expand the control object, the ID fills itself out and all is well.

It looks like the ID is only getting completed at the last moment - how can I ensure that I can get the ID without getting null? The same thing happens if I don't use the master page.

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