Get site collections from SharePoint Online

//using Microsoft.SharePoint.Client;
//using Microsoft.Online.SharePoint.TenantAdministration;

//string weburl = "https://site-admin.sharepoint.com";
//GetSiteCollections(credentials, weburl);

//This method returns the count of Site Collections available in the tenant
//Also returns thr url of all site collections
private static void GetSiteCollections(SharePointOnlineCredentials credentials, string weburl)
{
    using (ClientContext ctx = new ClientContext(weburl))
    {
        ctx.Credentials = credentials;
        Tenant tenant = new Tenant(ctx);
        SPOSitePropertiesEnumerable siteCollections = tenant.GetSiteProperties(0, true);
        ctx.Load(siteCollections);
        ctx.ExecuteQuery();
        Console.WriteLine("Total Site Collections in tenant: " + siteCollections.Count.ToString());

        foreach (SiteProperties site in siteCollections)
        {
            Console.WriteLine(site.Url.ToString());
        }

    }
    Console.WriteLine("Press any key to exit...");
    Console.Read();
}