[FunctionName("FluentRetry")]
    public static async Task Run(
        [ServiceBusTrigger(".", ".", Connection = "ServiceBusConnectionString")]Message message,
        MessageReceiver messageReceiver, 
        string lockToken,
        [ServiceBus(".", EntityType.Topic, Connection = "ServiceBusConnectionString")] MessageSender sender,
        ILogger log) =>

        await ServiceBusPolicy.Apply()
            .WithMessage(message)
            .WithSender(sender)
            .WithReceiver(messageReceiver)
            .WithLockToken(lockToken)
            .RetryCount(retryCount: 2, interval: 20)
            .OnDeadLettering(async _ => log.LogWarning("Deadlettering the msg"))
            .OnException(async ex => log.LogError(ex.Message))
            .OnScheduling(async (_, __) => log.LogWarning("Scheduling the msg"))
            .ExecuteAsync(async () =>
            {
                // ur code
                throw new System.Exception();
            });

   private void ConfigureServices(IServiceCollection services)
        {
            services.AddServiceBusRetryPolicy(builder => builder
               .WithRetryCount(2)
               .WithInterval(20)
               .OnException(async _ =>
               {
                   // onEx
               })
               .OnScheduling(async (_, __) =>
               {
                   // onScheduling
               })
               .OnDeadLettering(async _ =>
               {
                   // onDeadlettering
               }));
        }

public class ExponentialRetryDI
    {
        private readonly IServiceBusPolicy _serviceBusPolicy;
        public ExponentialRetryDI(IServiceBusPolicy serviceBusPolicy)
        {
            _serviceBusPolicy = serviceBusPolicy;
        }

        [FunctionName("ExponentialRetryDI")]
        public async Task Run(
            [ServiceBusTrigger(".", ".", Connection = "ServiceBusConnectionString")]Message message,
            MessageReceiver messageReceiver,
            string lockToken,
            [ServiceBus(".", EntityType.Topic, Connection = "ServiceBusConnectionString")] MessageSender sender,
            ILogger log) =>
           await _serviceBusPolicy.ExecuteAsync(message,
               messageReceiver,
               sender,
               lockToken,
               async () =>
               {
                   // ur code 
               });
    }