How to Programatically apply custom branding?

Here is a simple small code snippet.
Have Fun.

public void ApplyCustomBranding(string MasterPageUrlPath, SPWeb site)
        {
            if(site == null)
            {
                site = SPContext.Current.Site.RootWeb;
            }
            if(string.IsNullOrEmpty(MasterPageUrlPath))
            {
                MasterPageUrlPath = site.ServerRelativeUrl;
                if(!MasterPageUrlPath.EndsWith(@"/"))
                {
                    MasterPageUrlPath += @"/";
                }

                MasterPageUrlPath += @"_catalogs/masterpage/mynew.master";
            }

            site.MasterUrl = MasterPageUrlPath;
            site.Update();

            foreach(SPWeb child in site.Webs)
            {
                ApplyCustomBranding(MasterPageUrlPath, child);
            }
        }