Build error: “The process cannot access the file because it is being used by another process”

Question

I\'ve got a C# webforms app, that until today had been working just swimmingly.

Now today, all of a sudden, every time I try run the app, I get a file l

Answer 1

What we have discovered here, is the following: In the project properties page, Debug tab, uncheck the "Enable visual studio hosting process". I am unsure what this property is for, but it does the work once unchecked.