Using Polly lib with C# For retries.

PollyPolicyWithRetry.cs

var processingPolicy = Policy
  .Handle<SageLockingException>()
  .Or<SageProductException>()
  .WaitAndRetry(delay, onRetry: (exception, timeSpan, context) =>
  {
      HandleException(result, orderToProcess, exception);
  });
var orderResults = processingPolicy.Execute(() => sageOrderHandler.ProcessNewOrder(sageOrder));