How to catch ConfigurationErrorsException for violating maxRequestLength?

Question

I am limiting file size users can upload to the site from Web.config. As explained here, it should throw a ConfigurationErrorsException if size is not accepted. I tried to c

Answer 1

   catch (Exception ex)
   {
       if (ex is HttpException && (ex as HttpException).WebEventCode == 3004)
       {
            //-- you can now inform the client that file uploaded was too large.
       }
       else
           throw;
   }