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EventLevel Enumeration

.NET Framework (current version)

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Identifies the level of an event.

Namespace:   System.Diagnostics.Tracing
Assembly:  mscorlib (in mscorlib.dll)

public enum EventLevel

Member nameDescription

This level corresponds to a critical error, which is a serious error that has caused a major failure.


This level adds standard errors that signify a problem.


This level adds informational events or messages that are not errors. These events can help trace the progress or state of an application.


No level filtering is done on the event.


This level adds lengthy events or messages. It causes all events to be logged.


This level adds warning events (for example, events that are published because a disk is nearing full capacity).

The level signifies the severity of an event. Lower severity levels encompass higher severity levels. For example, Warning includes the Error and Critical levels, which are higher in severity.

The following example shows how to use the EventLevel class to specify event levels. This code example is part of a larger example provided for the EventSource class.

[Event(1, Message = "Application Failure: {0}", Level = EventLevel.Error, Keywords = Keywords.Diagnostic)]
public void Failure(string message) { WriteEvent(1, message); }
[Event(2, Message = "Starting up.", Keywords = Keywords.Perf, Level = EventLevel.Informational)]
public void Startup() { WriteEvent(2); }
[Event(7, Level = EventLevel.Verbose, Keywords = Keywords.DataBase)]
public void Mark(int ID) { if (IsEnabled()) WriteEvent(7, ID); }

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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