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Home/ Questions/Q 835911
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T04:53:55+00:00 2026-05-15T04:53:55+00:00

In my ASP.Net 4.0 web.config I had the following attribute: <compilation targetFramework=4.0> If I

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In my ASP.Net 4.0 web.config I had the following attribute:

<compilation targetFramework="4.0">

If I remove the targetFramework attribute, everything appears to carry on as normal. Under what circumstances does this attribute help me?

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  1. Editorial Team
    Editorial Team
    2026-05-15T04:53:56+00:00Added an answer on May 15, 2026 at 4:53 am

    Quote from the doc:

    Specifies the version of the .NET
    Framework that the Web site targets.

    The default is Null.

    If this attribute is omitted, the
    target version is determined by other
    settings in the Web.config file and by
    the IIS application pool that the Web
    site is associated with. For more
    information, see
    CompilationSection.TargetFramework and
    .NET Framework Multi-Targeting for
    ASP.NET Web Projects.

    So basically if your application pool in IIS targets ASP.NET 4.0 and you omit this attribute nothing happens => your site still uses .NET 4.0

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