I used a extended log using example:
http://svn.apache.org/viewvc/logging/log4net/trunk/extensions/net/1.0/log4ne t.Ext.EventID/cs/src/EventIDLogImpl.cs?view=co . I have properties InstanceId that is setted in extended log: LoggingEvent loggingEvent = new LoggingEvent(ThisDeclaringType, Logger.Repository, Logger.Name, Level.Info, message, exc); loggingEvent.Properties["InstanceId"] = logData.DCSInstanceId; Logger.Log(loggingEvent); I received error: [6108] log4net:ERROR XmlHierarchyConfigurator: Cannot find Property [conversionPattern] to set object on [log4net.Appender.AdoNetAppenderParameter] Where it is the problem? Do you can help me? The logs works correctly if uses other appender: "log4net.Appender.OutputDebugStringAppender" I used log4net 1.2.10.0(windows) with following configuration for log4net: <log4net> <appender name="AdoNetAppender_SqlServer" type="log4net.Appender.AdoNetAppender"> <bufferSize value="100"/> <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <connectionString value="data source=XXX; initial catalog=XXX; integrated security=false;persist security info=True;User ID=XXX;Password=XXX" /> <commandText value="[Routine].[usp_InsertLog]" /> <commandType value="StoredProcedure" /> <parameter> <parameterName value="@log_date" /> <dbType value="DateTime" /> <layout type="log4net.Layout.RawTimeStampLayout" /> </parameter> <parameter> <parameterName value="@message" /> <dbType value="String" /> <size value="4000" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%message" /> </layout> </parameter> <parameter> <parameterName value="@instance_id" /> <dbType value="int32" /> <layout type="Dcs.Log.ProtocolInfoPatternLayout, Dcs.Log" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%P{InstanceId}" /> </parameter> </appender> <root> <level value="DEBUG" /> <appender-ref ref="DebugView" /> <appender-ref ref="AdoNetAppender_SqlServer" /> </root> </log4net> Have a nice day Andy