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Are you using safe Http Headers?

There are a variety of web applications out there which are relying on http headers for different purposes: automatic redirection, streaming a binary file to the client, controlling how content is cached on the client, adapting the site’s functionalities Read More...
Posted Sunday, May 11, 2008 5:02 PM by carloc | 0 Comments
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“Invalid postback or callback argument” in ASP.NET

I saw this error twice recently, but as often happens for two completely different cases so here they are, hope it helps someone to same their time… Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> Read More...
Posted Friday, May 02, 2008 2:44 PM by carloc | 2 Comments
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Missing ASP.NET Tab in IIS Management Console (the solution)

Remember this problem ? Well, Tom (and Jeremy and Vandana) has a solution     Carlo Quote of the day: There is no abstract art. You must always start with something. Afterward you can remove all traces of reality. - Pablo Picasso Read More...
Posted Wednesday, April 23, 2008 12:13 PM by carloc | 1 Comments
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Impersonation and remote shares

Let’s say you developed an ASP.NET application the assemblies are hosted on a network share: if you try to get the authenticated user using System.Environment.UserName you’ll get the account configured to access the network share in IIS ( Read More...
Posted Monday, April 14, 2008 9:01 PM by carloc | 1 Comments
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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 carloc | 3 Comments

MaxConnection does not have effect on ASP.NET 2.0

An interesting change which you might have missed in .NET 2.0 is about the autoConfig setting for the <processModel> element. The customer was running out of available connections while accessing a remote web service and was trying to apply what’s Read More...
Posted Monday, March 31, 2008 4:06 PM by carloc | 0 Comments
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Web Garden, AppDomain, statics… when Sql Server is not enough to save your session

Things have gone a bit crazy lately, we’ve been under a huge workload and the time left for blogging was virtually non existent… but the good thing is that I’ve been working on a few interesting cases I hope I'll have time to blog about, Read More...
Posted Sunday, March 30, 2008 10:34 PM by carloc | 1 Comments
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Unable to use SQL Server because ASP.NET version 2.0 Session State is not installed on the SQL server

I run across this error today while setting up a repro for a problem I'm working on; the first time I through I did something wrong between the mess of things which case across my hands today (maybe I've used the wrong .sql script? ), but after removing Read More...
Posted Wednesday, March 05, 2008 8:47 AM by carloc | 2 Comments
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aspnet_wp.exe can not be started. Code: 80070003

This was a Windows 2000 server with ASP.NET 1.1 installed, and for some reason the customer was unable to start his web applications, he was getting "Server Application Unavailable" messages on the client. We found the Application event log Read More...
Posted Tuesday, February 19, 2008 3:45 PM by carloc | 1 Comments
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Want to persist your properties as markup?

Last week I got a request from a customer whom was developing a custom ASP.NET control targeted for other developers, and one of his requirements was to persist the control's properties in the html markup, even for the default values which normally Visual Read More...
Posted Thursday, February 14, 2008 10:15 PM by carloc | 0 Comments
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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 carloc | 2 Comments

Need to print from a x64 machine? Can you wait 60 seconds?

I guess some of you might have developed a web application which, among other functionalities, prints some kind of report; and sooner or later you might consider to move the application to a 64 bit machine. At this is what this customer did. They had Read More...
Posted Thursday, January 31, 2008 8:33 PM by carloc | 1 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 carloc | 4 Comments

Application, Page and Control lifecycle

The problem Every now and then we receive an advisory case from a customer whom needs some advices from us about how to implement some kind of functionality, and this particular one had an interesting and weird behavior with the viewstate in a custom Read More...
Posted Wednesday, December 19, 2007 4:58 PM by carloc | 0 Comments
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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 carloc | 4 Comments
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