ASP.NET Tutorial/Page Lifecycle/Trace

Tracing using Page.Trace

File: Web.config
<configuration>
    <system.web>
        <trace enabled="true" pageOutput="true" />
    </system.web>
</configuration>
C#
protected void Page_Load(object sender, EventArgs e)
{
    Trace.Write("This message is from the START of the Page_Load method!");
}