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I have asp.net website on my local machine including library project. Having issue while building website. I am using framework 3.5 and visual studio 2010 and my System OS is Windows 10. Library project having build target platform on any cpu.

I tried with referencing System.Web.Extension.dll from c:/program files/reference assemblies/framework/.. also tried referencing from c:/windows/microsoft.net/framework/.. and also tried with dll from framework64 folder

I can not publish my asp.net web site because it is showing compile time errors.enter image description here

Abhiraj Shinde
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    Upgrage your project to `Framework 4.6.1`. – Muhammad Aftab Oct 04 '19 at 07:36
  • @MuhammadAftab Is their any other solution? – Abhiraj Shinde Oct 04 '19 at 08:37
  • System.Web.Extension**s** should do it (with 's'). Is your web.config updated too? See [here](https://learn.microsoft.com/en-us/aspnet/web-forms/overview/older-versions-getting-started/aspnet-ajax/understanding-asp-net-ajax-web-services). If it doesn't work, consider upgrading .net version. it won't hurt anything. – wazz Oct 04 '19 at 09:33
  • I got the solution : https://stackoverflow.com/questions/3053181/cannot-find-system-web-script-service-namespace-error-after-upgrading-to-visual – Abhiraj Shinde Oct 09 '19 at 06:18

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