c# - Where is DefaultRenderMvcControllerResolver located in Umbraco Api -

for custom controller hijacking mentioned umbraco documentation here custom controllers (hijacking umbraco routes)

i not unable find namespace , assembly class mentioned defaultrendermvccontrollerresolver code snippet below,

public class myapplication : umbracoapplication {     protected override void onapplicationstarting(object sender, eventargs e)     {         defaultrendermvccontrollerresolver.current.setdefaultcontrollertype(typeof(mycustomumbracocontroller));         base.onapplicationstarting(sender, e);     } } 

the namespace umbraco.web.mvc available v6.1 onwards think.

all code open source , available @ https://github.com/umbraco/umbraco-cms