使用AppDomain实例化DLL中的类

I have a website that on user-demand compiles a class on the fly and deposits the dll(named Equation.dll) in a subdirectory of the website. The administrator can recompile at any time. However, once an instance of the class has been created, the message "The process cannot access the file because it is being used by another process" is displayed.I have a website that on user-demand compiles a