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Asked: 2026-05-23T05:58:22+00:00

I’m trying to see the output of a foreach loop in my code in

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I’m trying to see the output of a foreach loop in my code in the output window in an ASP.NET web app, but I don’t get any results even though there is valid data. I’ve done a fair amount searching using Google with this issue, but nothing I’ve done works. Here is the code in my ASPX page:

List<MyClass> myClasses = GetMyClasses();
foreach (MyClass myClass in myClasses)
{
    Debug.WriteLine(myClass.SomeProperty);
}

The code is very straight-forward. When I debug this page, myClass.SomeProperty has the value I want, but nothing is getting printed to the output window. What could I be missing? I cannot use a Response.Write because my Response stream is being used to create an Excel file. I also don’t want to use Tracing.

Update

I have this in my web.config file:

<system.web>
    ...
    <compilation debug="true" targetFramework="4.0">
    ...
</system.web>
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1 Answer

  1. Editorial Team

    (Sorry no full answer, but a bit long for a comment)

    There are debug related features. (Related What does the optimize switch do)

    • Generation of debug Symbols
    • C# IL optimization
    • Jitter Optimization
    • The DEBUG conditional define.

    What you need for your problem is the DEBUG conditional. I guess the debug="true" switch affects only the debug symbols but not the conditional.

    edit:
    hmm strange. scottgu states at http://weblogs.asp.net/scottgu/archive/2005/11/06/429723.aspx that debug="true" should affect that conditional.

    Note that the value of debug in a web app is driven by the value of the value in your web.config file.

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