Tracing tracks and presents the execution details about a Web request. For trace data to be visible in a rendered page, you must enable tracing at the page or application level.

Tracing on a page is disabled by default. To enable tracing for a page, use the @ Page directive <% @ Page trace="true" %>. To enable tracing for an entire application, you must enable it in the application's configuration file, Web.config, which resides in the root directory of the application. For more information, see ASP.NET Tracing Overview.

The following code example demonstrates accessing the TraceContextIsEnabled property and the TraceContextWrite method through the Trace property. This code calls the Write method only when tracing is enabled for the Page object. If it is not enabled, this code will not run, which can help reduce overhead for your application.

If (Trace.IsEnabled) Then

  Dim I As Integer
  For I = 0 To DS.Tables("Categories").Rows.Count - 1

    Trace.Write("ProductCategory",DS.Tables("Categories").Rows(I)(0).ToString())
  Next
End If

if (Trace.IsEnabled)
{
  for (int i=0; i<ds.Tables["Categories"].Rows.Count; i++)
  {
    Trace.Write("ProductCategory",ds.Tables["Categories"].Rows[i][0].ToString());
  }
}

.NET Framework

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

Other Resources