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Using Trace within Global.asax

<system.codedom>

  <compilers>

    <compiler language="c#;cs;csharp"

              extension=".cs"

              compilerOptions="/d:TRACE"

              type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.3500.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" warningLevel="1" />

    <compiler language="VB"

              extension=".vb"

              compilerOptions="/d:Trace=true"

              type="Microsoft.VisualBasic.VBCodeProvider, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

  </compilers>

</system.codedom>