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

I did had simillar problem solution for me was to look at the *.csproj file and under i found missing file so and below was correct one so i just removed lines and it worked straight away