IIS express: Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to

Question

In Visual studio, Solution->Web.Project->Properties->Web, I have changed my Project Url from http://localhost:51123/ to http://localhost:51123/NewProj

Answer 1

I tried all of the above methods and nothing worked for me. I was keep on getting the error something like

Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'QueryStringModule'

At last I changed my server from

IIS Express to Local IIS in the project property build as given below.

and it worked for me.