The Stupid Assembly and Temp ASP.NET files story

Question

really sorry for reposting before i posted some confidentional information by mistake

I am getting this exception, it started out of nowhere, I've got no idea why it's mis matching assemblies, I've had this error before for another assembly and solved it by deleting asp.net temp files but that was a different DLL.

Why is it loading the DLL from asp.net temp files when THE STUPID DLL is in GAC and web application's bin folder?

The operation failed. Bind result: hr = 0x80131040. No description available.

Assembly manager loaded from: c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll Running under executable c:\windows\system32\inetsrv\w3wp.exe --- A detailed error log follows.

=== Pre-bind state information ===
LOG: User = domainName\userName

LOG: DisplayName = some.DLLL, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)

LOG: Appbase = file:///C:/Inetpub/wwwroot/wss/VirtualDirectories/somefolder/Applications/somefolder/

LOG: Initial PrivatePath = C:\Inetpub\wwwroot\wss\VirtualDirectories\somefolder\Applications\somefolder\bin

LOG: Dynamic Base = c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\some folder\dfgdfgdf

LOG: Cache Base = c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\some folder\dfgdfgdf

LOG: AppName = 34tert4t4
Calling assembly : somelibrary, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.

Detailed Error by Fusion log

WRN: Comparing the assembly name resulted in the mismatch: PUBLIC KEY

TOKEN ERR: The assembly reference did not match the assembly

definition found. ERR: Setup failed with hr = 0x80131040. ERR: Failed

to complete setup of assembly (hr = 0x80131040). Probing terminated.

Answer 1

The Temp folder is used for assembly shadow copying as described here. It is basically to avoid locking the assemblies and allow their in-place update.