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WebThreadInformation Class

Provides information about the state of a thread in an ASP.NET process.

Namespace:  System.Web.Management
Assembly:  System.Web (in System.Web.dll)

[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class WebThreadInformation

ASP.NET health monitoring allows production and operations staff to manage deployed Web applications. The System.Web.Management namespace contains the health-event types responsible for packaging application health-status data and the provider types responsible for processing this data. It also contains supporting types that help during the management of health events.

Instances of the WebThreadInformation class contain information that is obtained using either the WebErrorEvent type or the WebRequestErrorEvent type.

Your application needs the appropriate permissions to access protected information provided by this type.


In most cases you will be able to use the ASP.NET health-monitoring types as implemented, and you will control the health-monitoring system by specifying values in the healthMonitoring configuration section. You can also derive from the health-monitoring types to create your own custom events and providers. For an example of creating a custom event class, see the example provided in this topic.

The following code example has two parts. The first is an excerpt of a configuration file that enables ASP.NET to use a custom event that uses the WebThreadInformation type. The second shows how to implement the custom event that uses the WebThreadInformation type.

Ensure that your custom event is raised at the proper time, that is, when the equivalent system health event it replaces would be raised.

    heartBeatInterval="0" enabled="true">

    <add name="Custom" 
      minInterval="00:00:00" />


type="SamplesAspNet.SampleWebThreadInformation,webthreadinformation, Version=1.0.1782.29648, Culture=neutral, PublicKeyToken=b3283a2de7dd3f27, processorArchitecture=MSIL" />



    <add name="Custom Web Thread Info Event" 
      profile="Custom" />


using System;
using System.Text;
using System.Web;
using System.Web.Management;

namespace SamplesAspNet
    // Implements a custom WebErrorstEvent that uses the  
    // WebThreadInformation.  
    public class SampleWebThreadInformation :
        private StringBuilder eventInfo;

        // Instantiate events identified  
        // only by their event code. 
        public SampleWebThreadInformation(
            string msg, object eventSource,
            int eventCode, Exception e)
            base(msg, eventSource, eventCode, e)
            // Perform custom initialization.
            eventInfo = new StringBuilder();
            "Event created at: {0}",


        // Raises the event. 
        public override void Raise()
            // Perform custom processing. 
                "Event raised at: {0}",
            // Raise the event. 

        // Get the impersonation mode. 
        public string GetThreadImpersonation()
            return (string.Format(
                "Is impersonating: {0}",

        // Get the stack trace. 
        public string GetThreadStackTrace()
            return (string.Format(
                "Stack trace: {0}",

        // Get the account name. 
        public string GetThreadAccountName()
            return (string.Format(
                "Request user host address: {0}",

        // Get the task Id. 
        public string GetThreadId()
            // Get the request principal. 
            return (string.Format(
                "Thread Id: {0}",

        // Formats Web request event information. 
        public override void FormatCustomEventDetails(
         WebEventFormatter formatter)

            // Add custom data.

                "Custom Thread Information:");

            formatter.IndentationLevel += 1;

            // Display the thread information obtained 
            formatter.IndentationLevel -= 1;





Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0