public async Task Update()
        {
            Subscription subscription = await Client.GetDefaultSubscriptionAsync();

            ResourceGroup rg = await CreateResourceGroup(subscription, "testRg-");

            string  afdProfileName = Recording.GenerateAssetName("AFDProfile-");
            Profile afdProfile     = await CreateAfdProfile(rg, afdProfileName, SkuName.StandardAzureFrontDoor);

            string      afdEndpointName1     = Recording.GenerateAssetName("AFDEndpoint-");
            AfdEndpoint afdEndpointInstance1 = await CreateAfdEndpoint(afdProfile, afdEndpointName1);

            string            afdSecurityPolicyName = Recording.GenerateAssetName("AFDSecurityPolicy-");
            AfdSecurityPolicy afdSecurityPolicy     = await CreateAfdSecurityPolicy(afdProfile, afdEndpointInstance1, afdSecurityPolicyName);

            string      afdEndpointName2     = Recording.GenerateAssetName("AFDEndpoint-");
            AfdEndpoint afdEndpointInstance2 = await CreateAfdEndpoint(afdProfile, afdEndpointName2);

            SecurityPolicyProperties updateOptions = new SecurityPolicyProperties
            {
                Parameters = new SecurityPolicyWebApplicationFirewallParameters
                {
                    WafPolicy = new WritableSubResource
                    {
                        Id = new ResourceIdentifier("/subscriptions/f3d94233-a9aa-4241-ac82-2dfb63ce637a/resourceGroups/CdnTest/providers/Microsoft.Network/frontdoorWebApplicationFirewallPolicies/testAFDWaf")
                    }
                }
            };
            SecurityPolicyWebApplicationFirewallAssociation securityPolicyWebApplicationFirewallAssociation = new SecurityPolicyWebApplicationFirewallAssociation();

            securityPolicyWebApplicationFirewallAssociation.Domains.Add(new WritableSubResource
            {
                Id = afdEndpointInstance1.Id
            });
            securityPolicyWebApplicationFirewallAssociation.Domains.Add(new WritableSubResource
            {
                Id = afdEndpointInstance2.Id
            });
            securityPolicyWebApplicationFirewallAssociation.PatternsToMatch.Add("/*");
            ((SecurityPolicyWebApplicationFirewallParameters)updateOptions.Parameters).Associations.Add(securityPolicyWebApplicationFirewallAssociation);
            var lro = await afdSecurityPolicy.UpdateAsync(updateOptions);

            AfdSecurityPolicy updatedSecurityPolicy = lro.Value;

            ResourceDataHelper.AssertAfdSecurityPolicyUpdate(updatedSecurityPolicy, updateOptions);
        }