The type or namespace name 'Optimization' does not exist in the namespace 'System.Web'

Question

I am deploying a new website as my main site and it works beautifully.

All of my applications under the root url work as well, except for one. It is a legacy system (c#

Answer 1

In Visual Studio .. Go to your project and see the References tree.

right click System.Web.Optimization and choose Properties

look for the path , you will find it empty if that is the case then look in your PC for the file names System.Web.Optimization.dll and copy it in the bin folder of your project and that will resolve it