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Important Beta 2 Information

7/30/2007 9:48:32 AM

A few days before we shipped Beta2 on the web, we discovered a side-by-side issue with ASP.NET AJAX. If you read my original VS 2008 and .NET 3.5 Beta Released blog post, you'll remember that I called out this post-install patch step to fix this issue: You should download and run this batch file. This takes only a few seconds to run, and fixes an issue we found earlier this week with the version policy of System.Web.Extensions.dll - which is the assembly that contains ASP.NET AJAX. If you don't run this batch file, then existing ASP.NET 2.0 projects built with ASP.NET AJAX 1.0 and VS 2005 will end up automatically picking up the new version of ASP.NET AJAX that ships in .NET 3.5 Beta2. This will work and run fine - but cause you to inadvertently introduce a .NET 3.5 dependency in the applications you build with VS 2005. Running the batch file will change the version binding policy of the new System.Web.Extensions.dll assembly and ensure that you only use the new .NET 3.5 ASP.NET AJAX version with projects that you are explicitly building for .NET 3.5. The good news is that this fixes the side-by-side issue we found, and makes it safe to develop ASP.NET AJAX with both VS 2005 and VS 2008 on the same machine. The one gotcha is that it causes VS 2008 to incorrectly detect the version of ASP.NET AJAX being used when first opening older ASP.NET 2.0 projects (specifically it can cause VS 2008 to think the project is already using .NET 3.5). This requires that you to take a few additional steps in Beta2 the first time you open existing ASP.NET AJAX 1.0 web-site projects with VS 2008 to correct this. You will not need to take these steps with the final VS 2008 release.


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