Recently we migrated our development environment from VS2008 to VS2010 (Ultimate).
For one solution (for now all C#, .NET Framework 3.5 and ASP.NET 2.0) which contains 6 projects VS auto-upgraded it without any problems.
The solution projects are:
Could not load file or assembly 'ClassLibrary1BLL, Version=126.96.36.199, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An API call exited abnormally. (Exception from HRESULT: 0x800300FA (STG_E_ABNORMALAPIEXIT))
<identity impersonate="true" userName="DOMAIN\user" password="password"/>
Check the permissions of the impersonation user.
After just setting the flag to false,
<identity impersonate="false"/>, it also came to life for me.
However, once setting it back to true, it built fine, but when I loaded the site, I got:
The current identity (XN-DTDEV\Fusion) does not have write access to 'C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files'.
Now this machine is on a domain, and that user is local, which should have administrative privileges. When I checked back, it didn't. It looks like there is a policy re-setting the local administrators each reboot.