Unable to copy file reference.dll to bin/reference.dll. The process cannot access the file reference.dll because it is being used by another process

Question

For one of my ASP.NET 3.5 applications, every single time I try to build the web app, it throws the following build errors in Visual Studio 2008:

Error 16

Answer 1

This issue commonly occurs when you change your project from one directory to another . For the Shadow copy error you might have added this line in your web.config.To fix this follow the following

In your web.config file if there is something like

change that into

or remove it .Then it will work fine