I faced this problem while upgrading .net 2.0 website application so that it may be used in VS 2008 but target framework as .net 2.0 and not 3.5. When I tried to compile the application I got following error.
'Could not load assembly or type System.Web.Extension....". I figured out that I don't have Asp.Net ajax extension installed. When I tried installing ajax extensions I got the title error again and again. After some googling I applied various suggestions like run the msi as administrator (FYI I was using VS 2008 in Windows Vista). Finally one solution worked i.e. the service Ngen was not running in my machine due to which installation action was being rolled back. So make sure you have this service running before you install Asp.net AJAX 1.0. See this forum for more info...
http://forums.asp.net/t/1069586.aspx?PageIndex=2
As suggested by Louis.Lu there is another work around if above method doesn't work
-------------------
hello, i'm from china, my english is nood good,
i think i could help you.
first, you double click "ASPAJAXExtSetup.msi", copy the following files to other places before the installation has errors.
C:\Program Files\Microsoft ASP.NET\ASP.NET 2.0 AJAX Extensions\v1.0.61025
AJAXExtensionsToolbox.dll
System.Web.Extensions.Design.dll
System.Web.Extensions.dll
second, copy the above files to "C:\WINDOWS\assembly"
finally, you go installation "ASPAJAXExtSetup.msi" again.
I succeeded like this.
good luck
----------------
Currently rated 4.5 by 4 people
- Currently 4.5/5 Stars.
- 1
- 2
- 3
- 4
- 5