Title left blank since I can't think of non inflammatory title for this post
time to read 1 min | 188 words

This works:

image

This doesn't:

image

I haven't bothered to find why, but that is surprising to me. (Note that here the enctype is specified as "multipart/form-data", which may or may not be related)

Update: It is not related.

The real culprit, as best I was able to reconstruct is because of this piece of code:

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapRoute(
        "Default", 
        "{controller}/{action}/{id}", 
        new {controller = "Home", action = "Index", id = String.Empty} 
        );
}

It looks fairly innocuous, doesn't it?

Except that this means that when ASP.Net MVC looks for a matching value for the "id" parameter, it will only look in the route parameters, and not look at the request parameters.

I found this surprising, to say the least.

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