is there any way to clear the buffer of a System.IO.StreamWriter so that it
does not do a flush when it is closed in the finaly block?

You have already posted this multiple times in different groups.  This has
nothing to do with security.  Please see the dotnet.framework ng for your
replies.

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Prevent access to advapi32.dll RevertToSelf()
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linkdemand for principalpermission
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Safe Source Code
security engineering for windows forms
aspnet users permission under SSL on windows server 2003