Implement Service Mesh in Microservices

Hello Team,

The question that I am going to put here , it might be very trivial but facing some issues. Please provide your insight.

I am designing an architecture of a system that has 10-15 microservices and I am planning to implement these in .Net Core ASPNET WEB API. I have a question how I will be implement the Services Mesh/ISTIO at my code for inter communication between microservices, Circuit breaking, Retry and all.

I have gone through many articles, and read out that this is implemented at the deployment stage not in the actual Code of Microservices.

So My questions, How I can define the inter communication between Microservice using Side CAR/ISTIO/Service Mesh.

Thanks for your Support.