If you’re about to start playing with AJAX in ASP.NET it’s a good idea to read this book: ASP.NET AJAX In Action by Alessandro Gallo, David Barkol, Rama Krishna Vavilala (see on amazon).
It very well describes basics of AJAX and shows basic and more advanced techniques of applying it in ASP.NET. There are exaplanations of Microsoft Ajax Library, UpdatePanel, ASP.NET AJAX client components, bulding AJAX-enabled controls, and much, much more. All well written and supported with extensive examples.
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I wanted to play around with ASP.NET AJAX Control Toolkit. There are a few steps to do before you can start using this tool. Among others, you need to build the Visual Studio Solution provided in the downloaded zip file.
When I tried to build the solution I got this error:
Error 1 Could not load file or assembly ‘vjslib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ or one of its dependencies. The system cannot find the file specified. C:\Program Files\Microsoft ASP.NET\Ajax Control Toolkit\TemplateVSI\TemplateVSI.csproj 60 5 TemplateVSI
Solution
This is what AJAX Control Toolkit documentation says:
The TemplateVSI project has a dependency on vjslib.dll which is a part of the Visual J# Redistributable…
The above mentioned package can be found there. Installing it solved this problem, at least on my computer.
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For those who develop web applications in ASP.NET and want to learn how to include AJAX I recommend a series of video tutorial on ASP.NET AJAX.
The series is created (from time to time new videos are added) by Joe Stagner and others from the Microsoft product team. It teaches the basic tricks and explanations of how things should be done.
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As a matter of fact I’ve been learning Java (for SCJP) and Microsoft .NET (because of project change) recently.
This week I attended two crash courses:
Those courses were fine; I refreshed a lot and learned some new stuff as well. Now it’s time to play around with this knowledge in real world 
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From now on I’ll be doing much more in Microsoft .NET rather than in Java. Thus, it seems my preparation for SCJP exam will slow down now… Also, I presume there’ll be slightly less about Java on that blog from now on (at least for some time).
I learned about .NET framework and C# programming language at the univesity, but it was a few years ago. Also, I’ve never been involved in a business project that used this framework. So, time to refresh the knowledge of .NET 
Luckily, it seems there shouldn’t be much difficulties in switching from Java to C#. Of course, those languages differ but still they have a lot in common. This article should be helpful in understanding the differences between Java and C#. It’s well written and the theory is supported with code examples.
After refreshing C# there will be time to re-learn ASP.NET…
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It’s possible to have more than one ASP.NET IIS installed and registrated on one machine (that runs Windows).
To check which version is currently registered run Command Line (Start/Run… and type ‘cmd’) and go to %SystemRoot%\Microsoft.NET\Framework\vXXX directory where %SystemRoot% is a special system-wide environment variable found on Microsoft Windows NT and its derivatives (read more on Wikipedia) and vXXX is the directory with ASP.NET IIS files.
Being in that directory, type aspnet_regiis -lv. You will be then given the list of installed/registered versions of ASP.NET IIS.
To register a new version of ASP.NET IIS, go to its direcotry in %SystemRoot%\Microsoft.NET\Framework (using Command Line) and run the following command: aspnet_regiis -i.
To unregister a new version of ASP.NET IIS, go to its direcotry in %SystemRoot%\Microsoft.NET\Framework (using Command Line) and run the following command: aspnet_regiis -u.
To learn more about ASP.NET IIS Registration Tool (Aspnet_regiis.exe) visit the description available on MSDN service.
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