CreateADUsersAndGroups method from Property Inspection Code Sample. Part of the AuthenticationHelper class found here: https://github.com/OfficeDev/Property-Inspection-Code-Sample/blob/master/PropertyManagerMyApp/PropertyManagerMyApp/Utils/AuthenticationHelper.cs

gistfile1.txt

 public async Task CreateADUsersAndGroups()
        {
            XmlDocument sampleData = new XmlDocument();
            var sampleDataUrl = HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Authority + "/Content/SampleData.xml";
            sampleData.Load(sampleDataUrl);

            this.client = await this.GetActiveDirectoryClient();
            //VerifiedDomain defaultDomain = await this.GetTenantDefualtDomain();
            String defaultDomainValue = System.Configuration.ConfigurationManager.AppSettings["DemoSiteCollectionOwner"].Split('@')[1];
            await ParaseXmlAndCreateADGroups(sampleData);
            await ParserXmlAndCreateADUsers(sampleData, defaultDomainValue);
            return;
        }