Wrapping up Asp.net Framework 4.0 in 3.5 - spring.net

I am working on an application in VS 2010 and using Asp.net framework 4.0 which i just migrated from Framework 3.5. The reason i had to migrate it to 4.0 is, i have a third party toolkit dll which is built in Framework 4.0, so in order to include it i had to change target framework of this project to 4.0. As, this project is being referred from other projects ans so on.., i end up converting whole application to framework 4.0. Every thing worked okay but as the application is using spring.net also, after successfully building the application, i found broken controls on almost all the pages. i am getting java script errors (about undefined control)for usercontrol PopupDatePickerControl we are using in the application. i downloaded and included latest version of Spring.net. i have no idea what is causing this problem. Please help if any one has experience working with this combination of framework 4.0 and spring.net? OR there is any way out to wrap up Framework 4.0 into 3.5. so i don't have to do this Migration.
Thanks!

Sounds like a shot in the dark on so many levels. It's probably not the combination of 4.0 and Spring.NET, unless you aren't referencing the correct Spring.NET dlls. Can you post parts of your IoC configuration and a rough outline of your app's architecture?
Also, what is the other third party toolkit you mentioned?

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No, you can't (if you mean anything more then editing text, cause for this you can use even notepad). But depending on language features used potentially you can copy-paste code into a .NET Framework 4.7.2 project and compile it. Or not, cause at least some newer features are not supported by older framework version.
Also you don't need full blown VS upgrade. You can look into installing just the .NET 6 SDK and VS Code (which requires less space compared to VS 2022).
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How do I upgrade an F# project from .NET Framework 4.7.2 to .NET 5.0?

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Can I compile and run a MVC1.0 application under .NET 4.0?

We have an MVC1.0 application that is compiled against and runs with .Net Framework 3.5.
The application was scanned for security and the scanning organisation reported
Microsoft ASP.NET ValidateRequest Filters Bypass Cross-Site Scripting
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https://community.qualys.com/docs/DOC-3495
What versions of Microsoft ASP.NET are vulnerable? Microsoft has
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Additionally, Qualys has confirmed that ASP.NET version 3 is also
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This may arise compatibility issues, Even though there are very few dependencies over the .net framework.
You can refer the following posts.
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In case you are still curious/not comfortable, there are some tools available to help verify dependencies and other items such at NDepend
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Anyway - the toolkit is no longer the "toolkit" - it's part of the platform (for the most part) and if you have beta, you already have it. Just make sure that Micrsoft.Web.Mvc dll is in your bin.
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