Deny code execution IIS7 with web.config

I want to block users run specific extensions in an upload folder (/assets/public/) of a web application. Users can upload image files which are also re-sized during the upload. But for more security I want to deny scripts like aspx, asp, php...

I have current code which blocks every extension but I want to allow extensions like .jpg:

<location path="assets/public">
    &开发者_如何学编程lt;system.web>
        <authorization>
            <deny users="*"/>
        </authorization>
    </system.web>
</location>
<system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>

Also users do not have FTP access and application is pre-compiled.

Try

<httpModules>
    <clear />
</httpModules>

or

<location path="." inheritInChildApplications="false">
</location>

Here is how I solved this with global.asax and routing. Just added these rules:

routes.MapPageRoute("any", "assets/public/{file}.{ext}", "~/e/404.aspx");
routes.MapPageRoute("any-sub","assets/public/{sub}/{file}.{ext}","~/e/404.aspx");

routes.Ignore("{any}.jpg");
routes.Ignore("{any}.png");
routes.Ignore("{any}.gif");
routes.Ignore("{any}.pdf");