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WebResource.axd going over HTTP when we are browsing on HTTPS

Consider this scenario: you are browsing a web site which at some point switches from http to https, and your browser show you a warning. In Firefox you get: Connection Partially Encrypted Parts of the page you are viewing were not encrypted before being Read More...
Posted Monday, March 02, 2009 9:53 PM by Carlo Cardella | 1 Comments

Strict mode and 100% CPU in IE 7

I got a couple of cases of this kind recently, one where the web pages were served by PerformancePoint and the other one was a completely custom web site, but both of them shared the same common root issue: browsing some specific pages, the CPU on client Read More...
Posted Monday, February 16, 2009 9:27 PM by Carlo Cardella | 3 Comments
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HoverNodeStyle not applied with partial postback

The TreeView control has built-in Ajax capabilities when it comes to dynamically fill it nodes; this is done through the PopulateNodesFromClient : Sometimes, it is not practical to statically predefine the tree structure due to data size or custom content Read More...
Posted Friday, January 02, 2009 11:39 PM by Carlo Cardella | 0 Comments

How to disable HTTP compression for specific file types?

The question arose from a customer whom had implemented an application to stream PDF files from ASP.NET and was also using HTTP compression to save bandwidth and improve download time; using IE 6, Adobe Reader failed to open the file with the following Read More...
Posted Wednesday, December 31, 2008 4:56 PM by Carlo Cardella | 3 Comments
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Troubles downloading public symbols?

Imagine you are debugging your dump, are already looking forward for the output of the command you just typed (say a kpn to get the stack of a thread) and you get this message instead: *** ERROR: Symbol file could not be found.  Defaulted to export Read More...
Posted Friday, November 14, 2008 8:30 AM by Carlo Cardella | 1 Comments

DropDownList with tooltip

I recently got this question from a customer whom is binding some data to a DropDownList control inside a GridView; the various items inside the DropDownList has variable length while the control itself per their page resign requirements must be fixed, Read More...
Posted Friday, September 26, 2008 9:35 AM by Carlo Cardella | 5 Comments

Very slow TreeView in UpdatePanel

This is what we got couple of weeks ago: an Ajax enabled ASP.NET web application was using a TreeView control within an UpdatePanel to show a complex tree of hierarchical data (the sample we got had more than 2.000 nodes with varying degrees of nesting). Read More...
Posted Monday, April 14, 2008 12:05 PM by Carlo Cardella | 9 Comments

The message received from the server could not be parsed

Again on the Ajax-compression subject (see here and here ), here's another error I got recently: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response Read More...
Posted Wednesday, February 06, 2008 3:21 PM by Carlo Cardella | 9 Comments

Ajax resource intermittently not accessible (http compression)

A few days before Christmas I had a case where the customer was intermittently getting troubles with his javascript/Ajax resource; as usual everything was working fine on the development machine, but when moved on the production server the application Read More...
Posted Monday, January 21, 2008 4:18 PM by Carlo Cardella | 6 Comments

Don't let IE local cache drive you crazy!

I stumbled across this issue multiple times during my life of web developer (which begun about 10 years ago), it appeared every now and then to complicate things when I was in the middle of a heavy debugging sessions and doing frequent changes to my pages; Read More...
Posted Sunday, December 16, 2007 2:04 PM by Carlo Cardella | 4 Comments

HTTP error 406 with .NET Framework 3.0

I got a couple of cases about this problem recently... Imagine this scenario: you install the .NET Framework 3.0 on your client, and then browse an ASP.NET based web site; you get a 406 HTTP return code from the web server, which means "Client browser Read More...
Posted Friday, November 02, 2007 1:34 AM by Carlo Cardella | 2 Comments

Is your UserControl sluggish at loading?

Here's an interesting story about performance I had the chance to work on over the last couple of weeks. The object of the call was a UserControl embedded in Internet Explorer, which was very slow to load the first time you browsed the page, but then Read More...
Posted Monday, October 08, 2007 12:11 AM by Carlo Cardella | 8 Comments

Debugger not debugging, and Response.Redirect() not redirecting...

The customer was working on a WinXP machine joined to a domain, but had logged in using a local account (I've not tested if this may have contributed to the problem so this may be a useless information). Anyway to make things easy I connected to the faulting Read More...
Posted Wednesday, June 27, 2007 10:40 PM by Carlo Cardella | 0 Comments

Avoid UAC prompt in IE component

Wow, this has been a tough one I closed this afternoon. The customer has developed a custom IE toolbar to interact with their portal, and found that when running this on Vista, IE displayed a warning dialog asking the user's consent to run an external Read More...
Posted Friday, June 22, 2007 10:45 PM by Carlo Cardella | 15 Comments

Broken line in ASP.NET 2.0 TreeView in IE 7

Create a very simple page in ASP.NET 2.0, add a TreeView control and set ShowLines=true ; now browse the page with Internet Explorer 7: you'll very likely see something like this:   In IE 6 this looks good... The point is that Internet Explorer 7 Read More...
Posted Wednesday, May 23, 2007 8:48 AM by Carlo Cardella | 43 Comments
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