Special Edition Using® Microsoft® ASP.NET

Trace Messages

The first thing to understand is how to add trace messages to ASP.NET pages. All you must do is add a Trace=True attribute to the @page directive at the top of the ASPX page, as follows:

<%@ Page language=”c#” Trace=”true” Codebehind=”WebForm1.aspx.cs” 
   AutoEventWireup=”false” 
   Inherits=”Chapter22.WebForm1” %> 

Adding the Trace=True attribute ASP.NET generates extensive information about requests made to that page and appends it as part of a page rendering, as shown in Figure 22.1.

Figure 22.1. Adding Trace=true to the @Page directive causes ASP.NET to output extensive trace information.

Consider for a minute what kind of information ...