Delete all custom Domain certificates AppService

I created a form where I can add but also delete a custom domain and certificate.I delete the domain in the following way:

var hostBinding = hostnameBindings.Get(_customDomain);if (hostBinding != null){    SiteHostNameBindingResource siteHostNameBinding = hostBinding.Value;    await siteHostNameBinding.DeleteAsync(WaitUntil.Completed);}

But I don't know how to delete the certificate:

AppCertificateCollection certcollection = _resourceGroupResource.GetAppCertificates();

If I know the name of the certificate, I can do it like this:

var certificate = certcollection.Exists("name");certificate.Delete();