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?

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.

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).