ASP.net offers a built-in functionality for tracing the
application. Using this functionality one can view a lot of
diagnostic information which is rendered as the page output when the
tracing is enabled. This tracing information can also be viewed using
Trace Viewer. Tracing is output in a tabular format on the page and
in the trace viewer too.
As many other features, tracing can be enabled at the
page level as well as at the application level.
To enable tracing at the Page level, include
Trace=”true”
attribute
in the @Page directive, for the page you want tracing to be enabled.
<%@
Page
Language="C#"
AutoEventWireup="true"
CodeBehind="Default.aspx.cs"
Inherits="TestTracing._Default"
Trace="true"%>
Run your application, and
you'll see the Tracing information on the page where tracing has been
made enabled. This information is always showed at the bottom of the
page after all the page controls are done with rendering. So, if you
have nothing on the page, the page will be showing only the Tracing
information.
To enable tracing at
the Application level, add a trace element
as a child to the system.web element and set its 'enabled'
attribute to 'true'.
<system.web>
<trace
enabled="true"
pageOutput="true"
requestLimit="10"/>
</system.web>
The other attributes
include;
pageOutput; which lets
you choose whether to output the tracing information in the page too
or only in the trace viewer. requestLimit; number of
trace requests to store on the server. Default value is 10 for this
attribute.
To use Trace Viewer
for viewing Tracing information, just
navigate to “Trace.axd” in your application. Its in the root and
you can navigate to it by entering URL like this
“http://localhost/MyApplication/Trace.axd”
Tracing information includes;
Request Details, Trace Information, Control Tree, Session Collection,
Cookies Collection, Forms Collection, Headers Collection, Server
Variables.
