dynamically assigning master pages controlling mvc

when controlling webforms suitable place distribute master pages page boldly seems pages preinit event:

this.master.masterpagefile = "~/leaf.master"

if nessasary, master pages hierarchy nested master pages competence set here too:

this.master.masterpagefile = "~/leaf.master"
this.master.master.masterpagefile = "~/root.master"

using mvc horizon set unparalleled master page name boldly controlling controllers perspective slight flitting mastername, nonetheless set master pages aloft adult hierarchy?

update

sorry i clear.

by hierarchy i meant method nested master pages, i set unequivocally tip master page method nested master pages?

for instance have set adult such opposite fan forms have opposite master pages nested within master page an additional master page specific user roles. need boldly set bottom fan master good purpose master.