Infamous assembly binding error

Question

I really need help on this because I lost my hopes to correct the problem.

I am using Office Communications Server 64bit libraries. There are 3 dlls I use in the pro

Answer 1

I know this is an old question, but still seems to be a popular result when searching for a solution regarding a partial binding error in Visual studio. I had experienced a very similar issue to the original poster, but with the EntityFramework.dll and Visual studio 2015 (.ASP Web Forms project), however, the solution I found relates to a broad problem. Since I didn't find any answers similar to my solution, I thought it might be helpful to contribute what I found, and I hope it does help someone.

In my web.config I am impersonating a domain user that is a service account. This service account did not have access to my Temporary files folder, therefore when debugging, it could not copy the dlls out there, and therefore could not load them.

What finally tipped we off was going and physically looking in the temporary folder mentioned in the error message. In the original question above, you'll notice the lines "Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/Temporary ASP.NET Files..." When I looked in that folder, my DLLs were not there.

The solution for me was this: Since I was using 64bit environment, and impersonating a domain account, I added the domain service account user to my local C:/Windows/Microsoft.NET/Framework64/v4.0.30319/Temporary ASP.NET Files folder with write (and modify - for good measure) access.

Bottom line - make sure your Temp files folder grants write access to the user your app is running as.