framework 4 do I need to convert the whole website?

I have recently developed a vs2010 web application that I would like to add to my web site.
The existing website was developed using vs2008. The web site is hosted on a windows 2008 server running iis 7.
My new web application sits below my main website i.e.
mywebite
mywebsite/mynewwebsite

I hae set the application pools for the mynewwebsite to be asp.net v4.0, leaving the application pools for mywebsite as .net v2.0

If I try and open my new web application i.e. www.mywebsite\mynewwebsite.default.aspx then I get 500. Internal server error.

i assume that it is iis that is unhappy here.
Do I have to rebuild the whole of my web site to be vs2010  using asp.net v4.0.
Should I use ASP.Net v4.0 or ASP.net v4.0 Classic for my application pools, and should I have a separate and distinct application pool for each of my web applications ( I have 4 of these)

Just to clarify my clients can log on the web site as

www.webite/login.aspx
www.website/webapp1/login.aspx
www.website/webapp2/login.aspx etc etc

Can anyone point me in the right direction.?
 I have tried to migrate all of the website to asp 4.0 but without any success.
TrilobyteMKRAsked:
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richard_hughesCommented:
Hello, sorry for the late response

Yes, that application pool should be set to use asp.net 4

If it is to be set to classic or intergrated, test the website on both settings.

Thanks,

Richard Hughes
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richard_hughesCommented:
Hello TrilobyteMKR

What problems have you had in migrating the site to ASP .NET 4.0? It wouldn't be a bad thing to upgrade the whole site to 4.0 if some parts of it are running as 4.0

Thanks,

Richard Hughes
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TrilobyteMKRAuthor Commented:
I had the same issue with 500 internal serve error, I had put all of the code for the site through vs2010 and rebuit the web applications, ensuring that there were no errors in the build. Should be creating a separate application pool for each application and should it be asp 4.0 or asp 4.0 classic?
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TrilobyteMKRAuthor Commented:
Richard, thanks for your help. I had already upgraded the whole website to asp.net 4. It is now working fine thanks for your help
Malcolm
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