private async Task EnsureDeleteOldCertificates() { UserCertificateStore certificateStore = CertificateStores.GetUserStoreByName(StandardCertificateStoreNames.Personal); var certificateFinder = await CertificateStores.FindAllAsync(new CertificateQuery() { IncludeDuplicates = true, IncludeExpiredCertificates = true }); foreach (Certificate oldCertificate in certificateFinder) { if (oldCertificate.Issuer.StartsWith("Azure IoT Edison Intermediate")) { try { await certificateStore.RequestDeleteAsync(oldCertificate); } catch (Exception e) { DebugHelper.LogWarning($"An old certificate could not be deleted: {e.Message}"); } } } }