I just ran into some odd behavior with the HyperLink control ASP.Net. Per the W3C, you’re supposed to HtmlEncode ampersands, using & instead of ‘&’ when building URLs in your HTML code. The reason is that the ‘&’ is assumed to be an entity reference. What’s nice is most web browsers can recover from this type of error, but if you want your site to pass validation, you need to use & instead.

So I hooked up all of our URLs to use this method, especially when we wrote out URLs in our C# classes. What I found odd was if I did this using a HyperLink control instead of an HtmlAnchor control, .NET would write the & out in the URL instead of using ‘&’. Naturally this broke our site as query string references weren’t parsed properly. The fix was to use an HtmlAnchor instead.

I’m not really sure why .NET does this or if there’s another workaround for it, but this solution worked for me. I’d be curious to know the reason behind the behavior though.

Our new e-commerce site, ImportCostumes.com, has gone live!  Its been months since development began and after lots of blood, sweat, and tears (mostly over PayPal account setup and integration; more on that to come later), we’re ready to take orders.  We have lots of cool men’s costumes and women’s costumes.  We also have a large selection of boy’s and girl’s costumes, and not to mention awesome accessories!  Come check it out and buy some stuff!

We found a weird IE6 bug in Fright Catalog and YumDrop today.  Turns out, when in the checkout process, IE6 would display a message to the user that they were navigating from a secure page to an insecure page.  Firefox, IE7, and Camino wouldn’t display any notification message at all.  The IE6 warning was totally bogus, since the resulting page was definitely secure (little gold lock, no messages, etc.).  For a while, I thought it was a bug in IE6, but the more I thought about it, that didn’t make much sense. 

That’s when I discovered that the notification only came up on a PostBack on a checkout page, not when the page first loaded.  So, knowing that we manage our secure pages using what we call a Redirect Manager, I took a look at that.  After some digging, I realized I was kind of barking up the wrong tree, and the real issue was the lack of a trailing slash on the URL.  This is something that we can either fix in our redirect or in the Secure Redirect module we use.  What I found really interesting though, is that this wasn’t an issue in Firefox, Camino, or IE7.

Its been quite a long week. Late last night saw the coming of the latest edition of FrightCatalog.com. I think you’ll notice the more product centric slant its taken on this year. A little less glitz, a little more practicality. It should be MUCH faster too. Same framework as YumDrop.com and the soon to come ImportCostumes.com. Thanks for Kyle’s help, even though he’s moved on to a new venture.

I’ve been trying to contribute (when I have time) to the ASP.NET Forums lately. I’ve noticed that a lot of people who are new to ASP.NET don’t seem to know to use the Visual Studio debugger. When you see funky things going on in your code or behavior that you can’t explain, jump into the debugger. It’s saved me major headaches before. That and its good to walk through your code line by line for testing purposes. It makes you analyze each line if cide to make sure its doing what you expect it to do. So, moral of the story, don’t be afraid of your debugger, it’s your friend!

I like it when my code works. Most developers do. What I don’t like is when code I KNOW works all of a sudden STOPS working. I spent a good 3 hours ripping my hair out trying to figure out why all of a sudden UrlReferrer was always null in my ASP.NET application. A week ago, my code worked great. Today it doesn’t. I did a lot of digging, asked a couple questions on the ASP.NET forum, but no luck. Then today, I stumbled upon this thread. Could this be? A third part application, one I use to protect my development machine, be hosing my app? Turns out it was. Calling the same code from my MacBook worked as expected.

So what happened? I think a NAV virus definition update changed how the headers appear in HTTP requests from my machine, as stated in the article. I realize we depend on these third party virus protection software applications to protect us from malicious software and the like, but this is crazy. At least tell me you’re doing it and then give me an EASY way to turn it off.

Another interesting implication of this, that was briefly touched on in the above mentioned thread is, would this affect statistics capturing software? Would the stats in Google Analytics be skewed? My guess is yeah, to some degree they will be if header information is held back. What are other people’s thoughts on this?

There are a few types of caching in ASP.NET, specifically Page Output Caching and Object Data Caching. There are whole hosts of articles out there on using the cache, but for the purposes of this post, I’m going to talk about just using Object Data Caching. To many, this will be obvious, but some cache code I wrote recently made me remember that this can sometimes be confusing in the context of an ASP.NET page.

Typically, you can access the cache from just calling Cache.Add or HttpContext.Curent.Cache.Add. This gives you access to the application wide Cache object. Any object you cache here will be available to any class within your application for the time period you specified for the cached object.

But what if you want to just cache an object for a request? Say you have an item object that you reference on 4 or 5 controls on a page? You don’t want to go to the DB to get the data each time you reference it. Instead, use the HttpContext.Current.Items collection and put your object there. It will be good for the duration of the request.

The two are very different. The first will make your cached data available application wide, to all requests. This can be dangerous if the data might be different for one user than it is for another. The second is available only to the current request. Use this if you load up an object say from the database in one control, but need it in subsequent controls that make up the same request.

Be careful with your cached objects and keep an eye on where you’re putting them. Not doing so can have some potentially disasterous effects.