in the process of using rabbitmq, I now encounter a thorny problem, which is similar to multithreading, such as sending registration verification emails.
I am now writing with the c-sharp console application, and I can only open multiple windows to enable multiple consumers to execute tasks concurrently, as shown in the following figure.

now my question is whether I can start multiple consumers to process it with only one window open, and I may put this application into the window service to execute in the future.
I have tried to create multiple consumer, in channel and then start these consumer, result programs. Still, there is only one consumer working, and the task is executed one by one on Synchronize.
rabbitmq has few articles on this aspect. I have searched websites both at home and abroad, but I can"t find a solution.