Running a ASP.NET 4 app in .NET 2.0 app pool

Question

I recently upgraded a .NET 2.0 app to .NET 4 and everything works great.

When I setup IIS I selected .NET 2.0 under the ASP.NET tab in IIS 6.

The app runs fine but I get these intermittent ViewState errors.

Could the IIS setup be causing the ViewState issues?

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

Probably because view state in .Net 4 uses a different algorithm than earlier

ASP.NET uses both encryption and hashing algorithms to help secure data such as forms authentication cookies and view state. By default, ASP.NET 4 now uses the HMACSHA256 algorithm for hash operations on cookies and view state. Earlier versions of ASP.NET used the older HMACSHA1 algorithm.

ASP.NET 4 Breaking Changes

You need to register .Net Framework 4.0 in IIS, then run your site under Application pool for .Net 4.0

edited Jun 20, 2020 at 9:12

CommunityBot

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answered May 4, 2012 at 15:31

Habib

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Comments

Ovais Khatri · Accepted Answer · 2012-05-04 15:26:18Z

0

You need to register 4.0 framework, This link will help you: http://msdn.microsoft.com/en-us/library/k6h9cz8h.aspx

answered May 4, 2012 at 15:26

Ovais Khatri

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