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https://issues.apache.org/jira/browse/LOG4NET-202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682055#action_12682055
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Ron Grabowski commented on LOG4NET-202:
---------------------------------------

Have you tried using SqlDbType.Text and/or a size of -1?

http://stackoverflow.com/questions/596257/what-sqldbtype-maps-to-varcharmax

> AdoNetAppenderParameter.Size Property is not optional
> -----------------------------------------------------
>
>                 Key: LOG4NET-202
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-202
>             Project: Log4net
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 1.2.10
>         Environment: Windows Server 2008, .NET 3.5 SP1, SQL Server 2008
>            Reporter: Richard Dingwall
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> The AdoNetAppenderParameter.Size page 
> (http://logging.apache.org/log4net/release/sdk/log4net.Appender.AdoNetAppenderParameter.Size.html)
>  says "This property is optional. If not specified the ADO.NET provider will 
> attempt to infer the size from the value."
> However, I just got the following exception in the log4net internal debug 
> trace, with the following parameter (maps to a VARCHAR(MAX)):
> <parameter>
>       <parameterName value="@exception" />
>       <dbType value="String" />
>       <layout type="log4net.Layout.ExceptionLayout" />
> </parameter>
> log4net:ERROR [AdoNetAppender] Could not prepare database command [INSERT 
> INTO ....]
> System.InvalidOperationException: SqlCommand.Prepare method requires all 
> variable length parameters to have an explicitly set non-zero Size.
>    at System.Data.SqlClient.SqlParameter.Prepare(SqlCommand cmd)
>    at System.Data.SqlClient.SqlCommand.Prepare()
>    at log4net.Appender.AdoNetAppender.InitializeDatabaseCommand()
> This would suggest the Size parameter cannot be null.

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