Assembly: System.Web (in system.web.dll)
In order to allow for the specified string to be recorded in the log file, you first must enable the URI Query option of the Extended Logging Properties dialog box for the site that you want to log activity for in IIS.
To customize extended logging in IIS 6.0:
In IIS Manager, expand the local computer node, expand the Web or FTP Sites folder, right-click the Web or FTP site, and then click Properties.
Click the Web or FTPSite tab, and then select the Enable logging check box (if it is not already selected).
In the Active log format box, click W3C Extended Log File Format.
Click the Advanced tab, and then select the properties you want to log.
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.