- Should i use multi threading or launch multi process
If you want this concurrent, this is your only option if you need to wait for each to finish, and yes its fine (on the outset)
- Will i be require to isolate each process using application domain?
No they are a separate process, they're already isolated unless they choose to use shared resources.
- Do i need to assign GUID before launching each instance?
I have no idea, why would you need a GUID? you tell us
- What should be best practice i should follow?
The best practice is not run a console app multiple times. I'ts to put the functionality in code, and take ownership of what it does and how it does it.
- How can keep best control on instances for example if one instance did not completed or hung still other should continue to serve?
This is entirely your implementation detail. If these processes hang then you may need to kill them. as for how to control it? TPL, tasks, threading, CancellationTokens, Timers, this is up to you..
Update
Did you vote to multiprocess over multithread? I wanted to understand
what is the advantage or disadvantage using PROC and launching
multiple exe over using parallel threading . Which one is better. Just
an update instances will not hit any common file system (folder). and
How App Domain will make any difference?
They both have advantages.
Separate process are completely separate apart from operating system resources they share. Similar to separate app domains, its about as isolated as you can make a .net Structure. If total isolation is what you need, separate process might be a consideration.
The downside of separate processes, is you cant easily dedicate and divy resources.
Where as, under the one appDomain and single process, you can take advantages of TPL and better divvy up Threads and CPU and resources. That's to say, you have more fine grain control over whats going on, you don't risk of inefficient thread starvation and saturation, its easier to debug, and its easier to manage and maintain, its easier to log, its easier to start stop and cancel, and more fault tolerant. There are many more benefits to a single process, though i think you get the picture.
