nop.web.dll update

I added the following to RouteProvider.cs and built Nopcommerce using Visual Studio 2017 -

routeBuilder.MapLocalizedRoute("Signin-Facebook", "signin-facebook/",
                new { controller = "Customer", action = "Login" });    

But when I FTP the updated Nop.Web.Dll and Nop.Web.pdb files to /site/wwwroot location in Azure, NopCommerce breaks.

Am I missing a step?