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Home/ Questions/Q 659845
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T23:05:26+00:00 2026-05-13T23:05:26+00:00

web.config: <customErrors mode=On defaultRedirect=~/Foo.aspx /> When Foo.aspx.cs is running, how can I know that

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web.config:

<customErrors mode="On" defaultRedirect="~/Foo.aspx" /> 

When Foo.aspx.cs is running, how can I know that an uncaught exception is what sent me to Foo.aspx?

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  1. Editorial Team
    Editorial Team
    2026-05-13T23:05:26+00:00Added an answer on May 13, 2026 at 11:05 pm

    Check the Server.GetLastError() and also check the Response.StatusCode to determine why the page has been called.

    If you set the customErrors element on the web.config the defautRedirect page will only be called when an unknown state occus, that is, if you specify custom pages for status codes 404 and 403, for instance, your foo.aspx page will only be called when a different status appears.

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