In my case, the FileUpload only works when it is visible when the page is first time loaded (not a postback).  It will not work (Request.Files.Count returns 0) when it is hidden originally and then made visible during later AsyncPostBacks.  Maybe ASP.NET is confused, because I am also changing the submit button’s postback type between full postback and aysnc postback.  The submit button is used by other things, and I only want it to fire a full post back when files need to be uploaded, and in all other cases, I want it to fire async postback and only do partial update on my page.

I spent many hours trying many different solutions I saw on the internet, but none of them worked for me.  However, I found an important hint which led me to the final working solution.  That is the Enctype attribute of the Form.  I learned that the Form.Enctype has to be “multipart/form-data” when files need to be uploaded.  I think this is set automatically for you in normal cases, but it isn’t set up correctly in my case.  So, I manually set it to “multipart/form-data” in OnInit of my user control, and it solves the problem.

First, you need to download the jGrowl extension from here. After including the JavaScript reference to your source, you can begin creating messages by adding the following JavaScript to your page.

$.jGrowl("Customer order successfully submitted!");

jGrowl notifications can be sticky (i.e. you must close them) and they can also accumulate if you want to post several notifications at once. Here’s a quick glimpse of how these notifications can appear with some enhanced styling applied.

jGrowl Sample Notification