To deploy a webapp on IIS server with visual studio

 >Run visual Studio as administrator

>Click on "Build" and than click on "Publish"(screenshot below)

Note:- You will see dll files in bin folder by clicking on build or publish.

reference:- https://www.c-sharpcorner.com/UploadFile/b07128/deploy-Asp-Net-website-on-iis-in-our-local-machine/