How do you overload MVC Controllers to avoid repeating common code?

How do you overload MVC Controllers to avoid repeating common code?

I'm working on a new MVC 5 project. It's a single multi tenanted site that
allows many organisations and branches to maintain a page. All pages start
with the following url format:
http://mysite.com/{organisation}/{branch}/...
For example:
http://mysite.com/contours/albany/...
http://mysite.com/contours/birkenhead/...
http://mysite.com/lifestyle/auckland/...
I've declared my RouteConfig with the {organisation} and {branch} before
the {controller} and {action}:
routes.MapRoute(
name: "Default",
url: "{organisation}/{branch}/{controller}/{action}/{id}",
defaults: new { controller = "TimeTable",
action = "Index",
id = UrlParameter.Optional });
This is working just fine. However EVERY single controller now has
identical code in the top of it that examines the organisation and branch.
public ActionResult Index(string organisation, string branch, string name,
int id)
{
// ensure the organisation and branch are valid
var branchInst = _branchRepository.GetBranchByUrlPath(organisation,
branch);
if (branchInst == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
// start the real code here...
}
I'm keen on the DRY principle (Don't Repeat Yourself) and I'm wondering if
it's possible to somehow isolate that common code and change my controller
signatures to something like this:
public ActionResult Index(Branch branch, string name, int id)
{
// start the real code here...
}