c# asp.net 捕捉404错误转发到指定页面

在web.config里

<configuration>
    <system.web>
        <customErrors mode="On" defaultRedirect="GenericErrorPage.htm">
            <error statusCode="403" redirect="NoAccess.aspx" />
            <error statusCode="404" redirect="FileNotFound.aspx" />
        </customErrors>
    </system.web>
</configuration>

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