Will ajax work in dot.net framework 2.0?

I have vs2005.Now I installed 2008 also in my machine(both are there).Previouly when I was opening 开发者_Python百科my vs 2005 solution file,there was no ajax control. Now it shows me ajax control in it.(but solution file show vs2005).Will it cause any error in future?

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No it wont. However, you need to convert your poject to 2008.

UpdatePanel and the other ajax extensions controls have been release on 2008 in .net framework 3.*. You can not add an UpdatePanel control to a project that is built on previous frameworks.

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Nope. ASP.NET AJAX was released with .NET 3.5 and Visual Studio 2008 (which is why 2005 doesn't have the controls in the toolbox).