How do I make a petrol pump management system using C#?
This is a bit like asking How do I build a mansion using a carpentry workshop? It sounds like a big task. Usually the first step in a complex software solution is to create the requirements that the software must comply to. Start with What Does This System need to do? How many pumps must it manage? Does it need to control the flow of the pump(s)? If so, what is the minimum and maximum flows? What happens when fuel runs out? Are there any backup systems? Blah blah. Once those requirements are laid out, you can start writing code to cover each requirement.